Have you ever stood in the drill bit aisle at the hardware store, completely overwhelmed by the wall of options? You are not alone. Picking the wrong bit can ruin your material, snap the bit, or leave you with a jagged, messy hole that ruins an otherwise great project.
I have been there too. After years of woodworking, metal fabrication, and home renovation projects, our team has drilled through just about every material you can think of. We learned the hard way that using a standard twist bit on tile is a recipe for cracked frustration, and that cheap bits on stainless steel will leave you going through three bits for a single hole.
Learning how to choose the right drill bit for every material saves you time, money, and a whole lot of headaches. The right bit cuts clean, lasts longer, and makes your projects look professional instead of amateur.
This guide breaks down everything you need to know. We cover drill bit materials, types, point angles, shank styles, and specific recommendations for wood, metal, masonry, tile, glass, and plastic. If you are also shopping for a new drill, check out our guide to the latest cordless drill deals to make sure your power tool can handle the job.
Whether you are a weekend DIYer or a seasoned tradesperson, this guide will help you match the right bit to the right material every single time.
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Choosing the right drill bit comes down to two simple decisions: identify your material first, then match the bit type and material to that surface. Every material has different hardness, density, and structural properties that require specific cutting geometry.
Here is the quick framework our team uses on every project. First, identify the material you are drilling into (wood, metal, masonry, tile, glass, or plastic). Second, pick a bit material that is harder than what you are drilling (HSS for soft woods, cobalt for hard metals, carbide for masonry, diamond for glass and tile). Third, choose the right bit type for the hole you need (twist for general purpose, brad point for clean wood holes, spade for large diameter wood holes, masonry for concrete). Fourth, set your drill speed correctly for that material.
That is it. Follow those four steps and you will get clean, accurate holes every time without damaging your bits or your workpiece. The rest of this guide goes deep into each of those decisions so you can make confident choices.
Reddit users on r/Tools put it well when they said that inexpensive bits are made from basic tool steel, while better ones use high-speed steel (HSS), and the best ones use HSS with cobalt added. Knowing these material differences is the foundation of drill bit selection.
The material your drill bit is made from determines how long it lasts, what it can cut through, and how much heat it can handle before dulling. This is where most beginners go wrong. They buy a cheap set of bits, try to drill through steel, and wonder why the bit smokes and dies in seconds.
Let me break down the five main drill bit materials you will encounter.
HSS is the most common drill bit material and works great for wood, soft metals like aluminum, and plastic. It is affordable, widely available, and handles higher rotational speeds without losing temper. Standard HSS bits are perfect for DIY projects and general-purpose drilling around the house.
One thing to keep in mind: HSS bits will struggle with harder metals like stainless steel. They will drill it, but they dull quickly and need frequent sharpening. For harder metals, step up to cobalt.
Cobalt bits are HSS with 5% to 8% cobalt added to the alloy. This makes them harder and more heat-resistant than standard HSS. Cobalt bits are the go-to choice for drilling through tough metals like stainless steel, cast iron, and hardened steel.
A key detail from forum discussions on Reddit: cobalt steel is harder throughout the entire bit, not just on the surface. Black oxide and titanium nitride are coatings applied to the outside of a standard HSS bit. Cobalt is built into the steel itself, which means you can sharpen a cobalt bit without losing its properties.
Carbide-tipped bits have a steel body with tungsten carbide brazed onto the cutting edges. Tungsten carbide is one of the hardest materials used in cutting tools, significantly harder than HSS or cobalt. These bits excel at drilling through masonry, concrete, brick, and other abrasive materials.
Solid carbide bits exist too, but they are expensive and brittle. For most DIY and professional masonry work, carbide-tipped bits offer the best balance of performance and cost.
Titanium nitride (TiN) coating gives standard HSS bits a gold-colored surface that reduces friction and increases surface hardness. These bits last longer than uncoated HSS and work well for repetitive drilling in soft to medium materials.
The catch is that titanium coating wears off eventually. Once the coating is gone, you are left with a standard HSS bit underneath. Sharpening a titanium-coated bit removes the coating from the tip, so they are not ideal for bits you plan to resharpen regularly.
Diamond drill bits use industrial diamond particles bonded to the tip or embedded in the cutting surface. They are designed for extremely hard, brittle materials like glass, ceramic tile, porcelain, and stone. Diamond bits grind rather than cut, using abrasive action to remove material.
These bits almost always require water as a coolant to prevent the diamonds from overheating and the workpiece from cracking. Dry drilling with a diamond bit will destroy both the bit and your material.
Now that you understand bit materials, let us talk about bit geometry. The shape of the bit determines what kind of hole it makes and what materials it works best on. Here are the most common types you need to know about.
Twist bits are the universal workhorse of the drill bit world. They feature spiral flutes that evacuate chips and debris from the hole as you drill. Use them for wood, metal, plastic, and most general-purpose tasks. Every drill bit set starts with twist bits because they handle about 80% of everyday drilling jobs.
For general household use, a set of HSS twist bits from a reputable brand like DeWalt, Bosch, or Irwin will cover most of your needs. These are the bits you grab when you need to drill a pilot hole, install a shelf bracket, or hang a picture frame.
Brad point bits (also called dowel bits) have a sharp center point and two outer cutting spurs. The center point keeps the bit positioned exactly where you want it, preventing the bit from wandering across the surface. The outer spurs score the wood fibers before the main cutting edges remove the material, producing a clean, splinter-free hole.
Use brad point bits exclusively for wood. They are ideal for furniture making, cabinetry, and any woodworking project where hole precision and cleanliness matter. Many woodworkers on Reddit recommend brad bits for wood alongside cobalt bits for steel.
Spade bits (also called paddle bits) have a flat, paddle-shaped cutting surface with a center point. They are designed for drilling large-diameter holes (typically 1/4 inch to 1-1/2 inch) in wood quickly. Spade bits are the tool of choice for running electrical wire through studs, installing door locks, or any rough carpentry work where speed matters more than a perfectly clean hole.
Spade bits are aggressive and can leave a rough exit hole, especially on the back side of the workpiece. Always clamp a scrap piece of wood behind your workpiece when using a spade bit to prevent tear-out.
Masonry bits look similar to twist bits but have a carbide tip brazed onto the end. The carbide tip does the actual cutting, while the flutes remove dust and debris. Masonry bits are designed for concrete, brick, block, and stone.
For serious masonry work, look for SDS (Slotted Drive System) shank masonry bits. The SDS system allows the bit to move back and forth inside the chuck, delivering hammer action that breaks up concrete as the carbide tip rotates. Standard round-shank masonry bits work in regular drills but cannot match the efficiency of SDS in a rotary hammer.
Step bits have a cone-shaped profile with multiple progressively larger diameters. Each step corresponds to a specific hole size, so one bit can drill several different hole diameters. Step bits are particularly useful for sheet metal, electrical panels, and thin materials where you need deburred, clean-edged holes.
One of the biggest advantages of step bits is that they avoid the need to swap bits when you need multiple hole sizes. They also create clean entry holes without the grabbing and spinning that twist bits can cause in thin sheet metal.
Forstner bits create flat-bottomed holes with extremely clean sides. They have a center point for positioning and a rim that shears the wood fibers as the bit rotates. Forstner bits are used for hinge mortises, concealed hinges, and overlapping holes where precision and a flat bottom are essential.
These bits work best in a drill press because they require steady, controlled pressure to perform well. If you need precision drilling at home, a good drill press for your home workshop makes Forstner bit work far more accurate than trying to use them freehand.
Auger bits have a deep spiral flute design with a single cutting edge and a feed screw at the tip. The feed screw pulls the bit into the wood automatically, while the deep flutes rapidly clear chips from deep holes. Auger bits are the standard for drilling deep, large-diameter holes in thick timber.
Use auger bits for boring through beams, posts, and thick lumber. They are commonly used in construction, timber framing, and plumbing work where you need to run pipes or cables through dimensional lumber.
Countersink bits create a conical recess at the top of a pilot hole so that a screw head sits flush with or below the surface of the material. Many countersink bits combine the pilot hole and countersink in one operation, saving time on projects with many screws.
If you do furniture building, deck construction, or any project where screw appearance matters, a quality countersink bit is essential. Some models let you adjust the depth of the countersink to match different screw head sizes.
Tile and glass bits have a spear-shaped carbide or diamond tip that grinds rather than cuts. They are designed for ceramic tile, porcelain, glass, and mirrors. These bits require low speed and constant water cooling to prevent cracking the material.
For larger holes in tile (such as installing a shower valve or pipe), use a diamond hole saw. These are essentially cylinders with diamond grit on the cutting edge. If you regularly drill large-diameter holes, check out our guide to hole saw kits for plumbing which covers options for tile, metal, and wood.
The point angle of a drill bit is the angle formed by the two cutting edges at the tip. The two most common angles are 118 degrees and 135 degrees, and the difference matters more than you might think.
A 118-degree point angle is the standard general-purpose angle. It works well for softer materials like wood, aluminum, brass, and mild steel. The wider angle creates a sharper point that penetrates material quickly and is easier to resharpen by hand. If you buy a standard drill bit set, most bits will have a 118-degree point.
A 135-degree point angle has a flatter, blunter tip. This angle is designed for harder materials like stainless steel, hardened steel, and other tough alloys. The flatter angle means the cutting edges engage the material more gradually, reducing heat buildup and bit walking on hard surfaces. The 135-degree angle also typically includes a split point, which prevents the bit from wandering when starting a hole without a pilot.
Here is a simple rule to remember. Use 118 degrees for soft materials and 135 degrees for hard materials. If you regularly drill both, consider getting two sets of bits so you always have the right angle ready.
As noted in the Grainger guide, the two most common point angles for metals are 118 degrees and 135 degrees. For aluminum specifically, a 118-degree angle provides the aggressive cutting action needed for softer metal. For stainless and tool steel, 135 degrees reduces friction and heat, extending bit life significantly.
Now we get to the heart of it. Here is our material-by-material breakdown with specific bit recommendations, speed settings, and pro tips gathered from years of testing and from the DIY community on Reddit and home improvement forums.
Wood is the most forgiving material to drill, but using the right bit still makes a big difference in hole quality. For most wood drilling tasks, standard HSS twist bits work fine. For furniture-grade work where hole cleanliness matters, step up to brad point bits. The sharp center point prevents wandering, and the spurs score the wood for a splinter-free entry and exit.
For large-diameter holes in wood (over 1/2 inch), use spade bits for rough work or Forstner bits for precision work. Auger bits are best for deep holes in thick timber. Always run wood bits at medium to high speed. Small twist bits (under 1/4 inch) can run at full speed. Larger bits (over 1/2 inch) should run at about half speed to prevent burning.
One common mistake is using too much pressure when drilling wood. Let the bit do the cutting. Excessive pressure causes burn marks, tear-out, and can even snap smaller bits. If you are doing precision woodworking joinery, our guide to pocket hole jigs for woodworking projects covers complementary drilling tools.
Metal drilling requires more thought than wood. The bit material and point angle matter enormously here. For soft metals like aluminum, brass, and copper, standard HSS twist bits with a 118-degree point work well. Run them at low to medium speed and use cutting fluid to keep the bit cool and clear chips.
For harder metals like mild steel and cast iron, step up to cobalt bits with a 135-degree point. Cobalt handles the heat and hardness better than standard HSS. Apply steady, firm pressure and use cutting oil or tapping fluid to lubricate the cut. Listen to the bit. If it squeals or smokes, you are running too fast or not using enough lubricant.
For stainless steel and hardened steel, cobalt bits are mandatory. Standard HSS bits will dull almost immediately. Run at very low speed, use plenty of cutting fluid, and apply consistent heavy pressure. Stainless steel work-hardens, meaning the surface gets harder as it heats up from drilling. Keeping the speed low and the pressure high prevents work hardening and lets the bit cut effectively.
As one Reddit user noted in r/Tools: for drilling a lot of metal, cobalt or titanium nitride bits work well. For wood, hex shank oxide bits are convenient because they do not slip in the chuck and are easy to swap.
Masonry drilling requires carbide-tipped bits. There is no substitute. Standard HSS or cobalt bits will barely scratch concrete and will dull in seconds on brick. Look for masonry bits with a carbide tip and deep flutes to clear dust efficiently.
For small holes in brick or block (up to 3/8 inch), a standard rotary drill with carbide masonry bits works, though it is slow. For anything larger, or for drilling into solid concrete, a hammer drill makes the job dramatically faster. The hammer action pulverizes the concrete while the carbide tip scoops out the debris.
For heavy-duty masonry work, SDS rotary hammers are the professional standard. SDS bits slide into the chuck without tightening and deliver powerful hammer blows that chew through concrete fast. For stucco specifically, use a carbide-tipped masonry bit. Stucco is a cementitious material and responds to the same bits used for concrete and brick.
Run masonry bits at low speed with hammer action enabled. Apply firm pressure but do not force the bit. Let the hammer action do the work. Pull the bit out periodically to clear dust from deep holes.
Tile drilling is where many DIYers crack their material and ruin a project. The key is patience, low speed, and water cooling. Use a carbide-tipped tile bit for ceramic tile (small holes up to about 1/2 inch) or a diamond hole saw for larger holes.
Start by placing a strip of masking tape over the drilling location. This prevents the bit from skidding across the glazed surface. Begin drilling at a 45-degree angle to create a starter notch, then gradually bring the drill to vertical. Run at very low speed. If your drill has a speed setting, use the lowest available.
Keep the bit wet. Dip it in water every few seconds, or have a helper spray water on the drilling site. Heat is the enemy. If the bit gets too hot, it will glaze over and stop cutting, or the thermal shock will crack the tile. Apply light pressure and let the abrasive action of the bit do the work.
For porcelain tile (which is harder than ceramic), diamond bits are the only reliable choice. Carbide tile bits may get through one or two holes in porcelain but will dull quickly. Diamond grit bits or diamond hole saws are worth the investment for any tile project involving porcelain.
Glass drilling requires diamond-tipped bits and extreme care. Use a diamond core bit or a diamond spear-point bit. Apply the same low-speed, constant-water-cooling technique as tile drilling, but with even more caution.
Start at an angle to create a scoring mark, then bring the drill to vertical. Use the lightest possible pressure. The diamond grit grinds through the glass rather than cutting it, and any lateral pressure can cause the glass to shatter. Place a piece of wood behind the glass to support it and catch the bit when it breaks through.
Safety is critical when drilling glass. Wear safety glasses and gloves. Work on a stable surface. Consider practicing on a scrap piece of glass before drilling your actual workpiece.
Plastic is relatively easy to drill but has one specific challenge: it melts. If the bit runs too fast or creates too much friction, the plastic softens and welds itself to the bit. Use standard HSS twist bits at low to medium speed.
For acrylic and polycarbonate sheets (Plexiglas, Lexan), a brad point bit gives the cleanest hole. The spurs score the plastic before the cutting edges remove material, preventing chipping and cracking. Pull the bit out frequently to clear chips and prevent heat buildup.
Apply light, steady pressure. If you feel the bit grabbing or the plastic starting to deform, stop immediately and let it cool. You can also run the bit in reverse briefly to score the surface before switching to forward to complete the hole.
Formica and laminate countertops can be drilled, but the laminate surface is prone to chipping and cracking. Use a brad point bit for clean entry holes, or a Forstner bit for larger-diameter holes. Place masking tape over the drilling location to prevent the surface from splintering.
Start drilling from the finished (visible) side of the laminate. The bit enters cleanly through the taped surface, and any tear-out occurs on the back side where it will not be seen. Run at medium speed with light pressure.
The shank is the part of the drill bit that fits into the drill chuck. The shank type affects how securely the bit is held, how easy it is to swap bits, and what drills the bit is compatible with.
Round shanks are the most common and work in any drill with a standard three-jaw chuck. They are held securely but can spin in the chuck if overtightened unevenly or if the chuck is worn. Round shanks are universal and found on everything from tiny twist bits to large Forstner bits.
Hex shanks have six flat sides that prevent the bit from spinning in the chuck. They are particularly popular on insert bits (bits that fit into a quick-change holder) and on impact driver bits. The hex shape provides positive grip without needing to crank down hard on the chuck. One downside is that hex shanks may not center as precisely as round shanks in a three-jaw chuck, which can cause slight runout on critical work.
SDS (Slotted Drive System) shanks are designed specifically for rotary hammers used in masonry work. SDS bits have two slots and two grooves that lock into a special SDS chuck. The bit can slide back and forth about an inch within the chuck, which is what creates the hammer action. SDS shanks come in several sizes: SDS-Plus for most DIY and light professional work, SDS-Max for heavy-duty applications, and Spline for some older professional tools. You cannot use SDS bits in a standard drill chuck without an adapter.
After years of watching beginners struggle with drilling, our team has compiled the most common mistakes we see over and over. Avoid these and you will save yourself from broken bits, ruined materials, and wasted money.
Running the drill too fast is the number one mistake. High speed generates heat, and heat destroys bits. A general rule: the harder the material, the slower the speed. Small bits in soft wood can run fast. Large bits in hard metal need to run very slowly. When in doubt, slow down.
Not using lubricant when drilling metal is another frequent error. Cutting fluid or even light oil dramatically extends bit life and improves hole quality. Without lubricant, the metal chips weld themselves to the bit cutting edges, creating a dull, galled surface that stops cutting.
Forcing the bit with too much pressure causes bits to snap, especially small-diameter twist bits. Let the bit cut at its own pace. Apply steady, consistent pressure but never force it. If the bit is not cutting, it is probably dull or running too fast.
Not using a pilot hole for large screws or large-diameter bits is a recipe for splitting wood and walking bits. Always drill a small pilot hole first, then step up to larger sizes incrementally. This is especially important in hardwoods and near the edges of boards.
Ignoring bit sharpness is something even experienced DIYers are guilty of. A dull bit works harder, generates more heat, and produces poor-quality holes. If you notice smoking, burning, or tearing, stop and sharpen or replace the bit. Learn to recognize the signs of a dull bit: the cut takes longer than it used to, the hole edges are rough, or the bit squeals during use.
Drilling without clamping the workpiece is dangerous and produces poor results. An unsecured workpiece can spin with the bit, especially when the bit breaks through the back side. Always clamp your material to a stable surface before drilling.
Good drill bits are an investment, and proper maintenance keeps them performing well for years. Here is how to take care of your bits so they take care of your projects.
Clean your bits after every use. Wood resin, metal chips, and masonry dust build up in the flutes and reduce cutting efficiency. Wipe bits with a clean rag after use. For stubborn resin buildup on wood bits, a quick wipe with mineral spirits or rubbing alcohol dissolves the residue.
Keep bits dry to prevent rust. Steel bits will rust if stored in a damp environment. Wipe them with a light coat of machine oil or WD-40 before storing if you live in a humid climate. A thin film of oil on the shank and flutes prevents corrosion without affecting performance.
Sharpen dull bits instead of throwing them away. Twist bits can be sharpened with a drill bit sharpener or a bench grinder with the right jig. Cobalt bits can be resharpened too, and since the cobalt is throughout the steel, sharpening does not remove any special properties. Carbide-tipped masonry bits can also be sharpened, though they require a diamond wheel.
Store bits in an organized case or index. Tossing bits into a drawer where they bang against each other dulls the cutting edges and creates nicks. Invest in a proper bit index or storage case. For garage and workshop organization, our guide to power tool organizers for garage storage covers options that keep bits sorted and accessible.
Use bits only for their intended material. Using a wood bit on metal or a masonry bit on wood damages the bit and produces poor results. Label your bit cases clearly so you always grab the right bit for the job.
Replace bits that are damaged beyond sharpening. A bent bit, a bit with chipped cutting edges, or a bit with a damaged shank should be retired. Continuing to use a damaged bit risks breaking it inside the workpiece, which is dangerous and difficult to remove.
Here is a quick-reference guide you can bookmark. For each material, it lists the best bit type, bit material, point angle, and recommended speed.
Softwood and Hardwood: Brad point or twist bit, HSS or titanium-coated, 118-degree point, medium to high speed.
Plywood and MDF: Brad point or Forstner bit, HSS, 118-degree point, medium speed.
Aluminum and Soft Metals: Twist bit, HSS or cobalt, 118-degree point, low to medium speed with cutting fluid.
Mild Steel: Twist bit, cobalt, 135-degree point, low speed with cutting oil.
Stainless Steel: Twist bit, cobalt (5% or 8%), 135-degree split point, very low speed with plenty of cutting fluid.
Concrete and Brick: Masonry bit, carbide-tipped, low speed with hammer action.
Block and Mortar: Masonry bit, carbide-tipped, low to medium speed with hammer action.
Stucco: Carbide-tipped masonry bit, low speed with hammer action.
Ceramic Tile: Tile bit (carbide spear point) or diamond bit, very low speed with water cooling.
Porcelain Tile: Diamond grit bit or diamond hole saw, very low speed with water cooling.
Glass: Diamond core bit or diamond spear point, very low speed with continuous water cooling.
Plastic and Acrylic: Brad point or twist bit, HSS, 118-degree point, low to medium speed with light pressure.
Formica and Laminate: Brad point or Forstner bit, HSS, 118-degree point, medium speed with masking tape on surface.
You can identify drill bits by their visual features. Twist bits have spiral flutes and a pointed tip. Brad point bits have a sharp center spur with two side spurs. Masonry bits have a carbide tip that looks slightly different from the steel body. Tile bits have a spear-shaped carbide or diamond tip. Spade bits have a flat paddle shape. Forstner bits have a rim with a center point.
Most quality bits are also stamped with their size and type. Check the shank for markings. When in doubt, compare the bit to a chart or reference guide. Over time, you will recognize bit types on sight, and choosing the right one becomes second nature.
Match the bit to your material by checking the tip. Twist bits with sharp points work for wood and soft metals. Bits with carbide tips are for masonry and concrete. Spear-shaped carbide or diamond tips are for tile and glass. Brad point bits with a center spur are for clean wood holes. Spade bits are for large holes in wood. When unsure, check the packaging or look for size and type markings stamped on the shank.
Pick a drill bit by first identifying your material, then choosing a bit material harder than what you are drilling. Use HSS for wood and soft metals, cobalt for hard metals, carbide-tipped for masonry, and diamond for tile and glass. Next, select the right bit type for the hole shape you need. Set your drill speed based on material hardness: slower for hard materials, faster for soft ones.
Yes, you can drill through Formica and laminate countertops. Use a brad point bit for small holes or a Forstner bit for larger holes. Place masking tape over the drilling location to prevent chipping. Drill from the finished side so any tear-out happens on the back. Run at medium speed with light, steady pressure for clean results.
Use a carbide-tipped masonry bit for stucco. Stucco is a cement-based material, so it responds to the same bits used for concrete and brick. A hammer drill with carbide masonry bits works best for larger holes. For small holes, a standard rotary drill with a carbide-tipped masonry bit will work but takes longer. Run at low speed for best results.
Knowing how to choose the right drill bit for every material is one of those skills that separates professional results from amateur frustration. The framework is simple: identify your material, pick the right bit material, choose the right bit type, and set the correct speed.
Start with a quality set of HSS twist bits for everyday tasks. Add cobalt bits if you work with metal regularly. Pick up carbide-tipped masonry bits for concrete and brick projects. Keep diamond bits on hand for tile and glass work. Build your collection as your projects demand it rather than buying a massive set you will never fully use.
Remember the golden rules: slow down for hard materials, use cutting fluid on metal, keep tile and glass bits wet, and always let the bit do the cutting. For precision drilling work, a quality drill press for your home workshop takes accuracy to the next level.
Take care of your bits and they will take care of you. Clean them after use, store them properly, sharpen them when they dull, and they will deliver clean holes for years to come. Now grab your drill and start your next project with confidence.