Choose a drill bit by the material first, then by the hole size and the tool you are using.
Brad-point, spade, auger, and Forstner bits are mainly for wood; twist and step bits are common choices for metal and plastic; carbide masonry bits are for brick, block, and concrete; and ceramic, porcelain, and glass require bits specifically rated for those brittle materials.
The right match produces cleaner holes and reduces heat, wandering, binding, and broken accessories.
Drill Bit Types and Uses by Material
Use this chart as a starting point. The bit and drill manufacturers’ instructions take priority, especially for hammer mode, large diameters, specialty shanks, and brittle surfaces.
| Material | Common bit choice | Best suited for | Important note |
|---|---|---|---|
| Softwood and hardwood | Brad-point, spade, auger, Forstner | Pilot holes, clean woodworking holes, larger bores | Clamp loose work and support the exit side when appearance matters. |
| Steel and aluminum | HSS twist bit, cobalt-alloy twist bit, step bit | General metal drilling and sheet metal | Larger diameters generally require lower speed; use suitable cutting lubricant when recommended. |
| Brick, block, concrete | Carbide-tipped masonry bit or specified rotary-hammer bit | Anchor holes and masonry drilling | Use hammer action only when both the tool and bit are designed for it. |
| Ceramic tile and glass | Carbide glass-and-tile bit rated for the material | Small holes in compatible ceramic tile or glass | Many carbide glass-and-tile bits are not rated for porcelain. |
| Porcelain and hard tile | Porcelain-rated carbide bit or diamond bit/hole saw | Hard, abrasive tile | Follow the accessory maker’s speed, pressure, and cooling instructions. |
| Plastic | Sharp twist bit, brad-point bit, or step bit where appropriate | Clean holes with limited grabbing | Control speed and clear chips to reduce melting. |
| Large-diameter holes | Material-specific hole saw; Forstner bit for wood | Openings for hardware, pipe, cable, and woodworking | Check the hole saw, arbor, drill, and material ratings before use. |
Twist Bits for General Drilling
A twist bit is the familiar spiral-fluted bit found in most drill sets. “Twist” describes the geometry; HSS, coatings, and cobalt describe the bit material or treatment. Sharp twist bits can handle wood, plastic, and many metals when rated for them, but specialized bits often produce cleaner results.
On smooth metal, a split-point tip or center-punch mark can reduce wandering; on visible woodwork, a brad-point bit usually locates more precisely.
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|---|---|---|---|
| DEWALT Drill Bit Set, 21 Pc High Speed Steel DEWALT Bits, Black and Gold Oxide Coated, 135 Degree… |
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Wood Bits: Brad-Point, Spade, Auger, and Forstner
Brad-point bits use a center point and outer spurs for accurate, clean-edged holes in wood, including dowel, shelf-pin, and cabinet-hardware work.
Spade bits cut larger holes quickly in lumber but often leave a rougher exit. For a visible face, finish from the opposite side when the project allows it.
Auger bits use a screw-like lead point and deep flutes for thick wood. Because the lead screw pulls aggressively, keep a controlled grip and be ready for reaction torque. Do not drill structural members unless the hole is permitted and concealed services have been checked.
Forstner bits make flat-bottomed, overlapping, and larger woodworking holes. A drill press gives the best control; handheld use should remain within the bit and drill manufacturers’ limits.
Metal Bits for Steel, Aluminum, and Sheet Metal
For many metals, use a sharp twist bit rated for the material. HSS suits ordinary drilling; cobalt-alloy twist bits are commonly intended for harder or more demanding metal work, but speed, pressure, and chip removal still matter.
A step bit is useful for progressively enlarging holes in sheet metal and some plastics, but it is not a universal substitute for a twist bit in thick stock. Check the stated material and thickness limits. Larger bit diameters generally call for lower speed in the same material. Clear chips, use suitable cutting lubricant when recommended, and handle sharp chips only after the drill stops.
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|---|---|---|---|
| BOSCH CO14B 14-Piece Cobalt Drill Bit Set with Case |
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Masonry Bits for Brick, Block, and Concrete
Masonry bits use a carbide cutting tip or insert for mineral materials such as brick, block, mortar, and concrete. Some work can be done with rotary drilling, while many concrete jobs are faster with a hammer drill/driver or rotary hammer and the specified shank system. Ulverion’s guide to choosing a cordless drill explains when hammer-drill capability is useful.
Use hammer action only when both tool and bit are designed for it. If a hole passes through tile into masonry, drill the tile first with the proper tile bit and no hammer action, then change setups after clearing the tile. Masonry drilling can create respirable crystalline silica dust, so use appropriate source control and follow applicable respiratory-protection instructions.
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|---|---|---|---|
| 14pcs Masonry Drill Bit Set Hex Shank Carbide Concrete Drill Bit 5/32″-1/2″ | $26.99 $24.29 | View on Amazon |
Tile and Glass Bits: Match the Exact Surface
“Tile bit” is not one universal category. Carbide glass-and-tile bits are commonly rated for ceramic tile and glass, but some manufacturers specifically exclude porcelain. Porcelain and other hard tile may require a porcelain-rated carbide bit or diamond bit/hole saw. Check the stated material rating first.
Use the accessory maker’s speed, pressure, and cooling instructions. Do not use hammer mode on tile or glass unless explicitly permitted for that exact application. If water or another coolant is specified, use it without creating an electrical hazard.
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|---|---|---|---|
| 10pc Dry Diamond Core Drill Bits Set, Tile Drill bits for Ceramic Porcelain Marble Granite Stone… | $21.99 | View on Amazon |
Hole Saws, Countersinks, Bit Size, and Shank Fit
Hole saw tooth design and cutting material vary, so a saw intended for wood is not automatically suitable for metal, tile, or masonry. Confirm the material rating, arbor or pilot bit, and the drill’s accessory capacity. Large hole saws can bind and create strong reaction torque; use required side handles and stop if the saw stalls.
A countersink cuts a shallow bevel for a compatible flat-head screw; a driver bit turns the fastener.
The cutting diameter must suit the hole, and the shank must fit the tool. Standard drill/drivers commonly use three-jaw chucks for compatible round or hex shanks, while rotary hammers often use specialized systems such as SDS-type interfaces. Never force a shank or improvise an adapter.
Screw pilot size depends on the screw design, material density, and whether the hole is a pilot or clearance hole. Follow fastener guidance when available and test on scrap for visible work or dense hardwood.
How to Drill a Cleaner Hole
- Mark and inspect the area. Before drilling into a wall, floor, or ceiling, consider hidden wiring, plumbing, ductwork, fasteners, and protective plates. Stop if the construction is uncertain.
- Secure the workpiece. Clamp boards, sheet metal, plastic, and other small or movable pieces instead of holding them by hand.
- Disconnect power before changing bits. Unplug the drill or remove/disable battery power as the manufacturer directs.
- Seat and tighten the bit correctly. Remove a chuck key before starting a keyed-chuck drill.
- Choose the correct mode and speed. Match rotary or hammer mode, gear, and speed to the material, bit, and drill.
- Use controlled pressure. If the tool slows sharply, chatters, overheats, or binds, stop and reassess the setup.
- Clear chips safely. Withdraw the bit when appropriate so packed chips do not increase heat. Wait for rotation to stop before handling debris.
- Reduce breakout at the exit. Back visible wood with scrap or finish from the opposite face when the bit type and project allow it.
Common Drilling Problems
The bit spins but barely cuts: it may be dull, damaged, mismatched to the material, or running at an unsuitable speed. Replace damaged bits. Sharpen only accessories the manufacturer identifies as serviceable.
The drill twists or grabs: release the trigger and stop. Binding is more likely with large bits, augers, hole saws, and metal drilling. Keep the work clamped, use required auxiliary handles, and do not continue with a bent bit, slipping chuck, or shifted workpiece.
Wood burns or plastic melts: heat is too high for the bit, speed, pressure, or chip-clearing rate. Stop and correct the cause rather than pushing harder.
Safe Habits for Every Drill Bit
Wear appropriate eye protection whenever you drill. Keep long hair, loose clothing, jewelry, and glove material away from the rotating chuck and bit. Gloves may be useful for handling sharp material after drilling, but they should not be allowed near exposed rotating parts.
Maintain a stable stance, clamp the workpiece, and use the handles specified by the drill manufacturer. Dust protection must match the material: a basic disposable dust mask is not a universal solution for silica, lead, asbestos, or other hazardous dust. If a material may contain asbestos, lead, or another hazardous substance, stop and arrange appropriate identification or professional assessment before disturbing it.
For a broader setup checklist, see Ulverion’s power tool safety basics for beginners.
The practical rule is simple: match the bit to the exact material and hole, then confirm that the shank, size, speed, and operating mode are compatible with your drill. A specialized bit is usually more predictable than forcing a general-purpose bit through the wrong material.
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