How to Choose the Right Drill Bit for Wood, Metal, and Concrete

A drill is only as good as the bit spinning in its chuck. Put a wood bit into masonry and you will burn the tip and polish the hole; put a masonry bit into oak and you will smoke the flutes and wander off your mark. Most ruined holes, cracked tiles, and stripped screws come down to one thing: using the wrong bit for the material, or using the right bit the wrong way.

This guide walks through the main bit families, what each one is designed to cut, and how to match the bit to the job. It also covers pilot and clearance holes, speeds and feed pressure, coatings, sharpening, and the mistakes that cost DIYers the most time and money.

The Bit Families You Actually Need

Walk down the drill bit aisle and the wall of packaging looks endless. In practice, four or five families cover almost everything a homeowner will ever drill, and one or two specialty bits handle the rest.

Twist bits: the universal starting point

High-speed steel (HSS) twist bits are the default bit in most kits. The 118-degree point is cheap, forgiving, and works acceptably in wood, plastic, and light metal. The 135-degree split-point version bites sooner and needs less pressure, which makes it a better choice for stainless steel and hard plastics. Twist bits cut slowly in wood and tear the exit side, so treat them as generalists rather than woodworking specialists.

Brad point, auger, and spade bits: wood specialists

Brad point bits have a sharp center spur that keeps the bit from skating across a board, plus two scribing cutters that slice clean edges. They are the right call for furniture, dowels, and anything where a tear-out ring would show. Auger bits bore deep, fast holes for bolts and wiring and pull themselves through the wood. Spade bits are flat and crude but cheap and quick for rough framing holes, though they leave a ragged edge and can blow out the back of the board.

Forstner bits: flat-bottomed holes

Forstner bits cut a clean, flat-bottomed hole with no center point running through the work. They are the standard for hinge recesses, cable pass-throughs, and shallow decorative holes. They need a drill press or a very steady hand, run at low speed, and should be withdrawn often to clear chips.

Masonry bits and SDS: concrete and brick

Masonry bits have a carbide tip brazed onto a steel body, which lets them grind through concrete, brick, and block instead of slicing. Standard masonry bits fit a three-jaw chuck. SDS-plus and SDS-max bits have slotted shanks that lock into a rotary hammer and take a much harder hammer blow, which is why they drill concrete several times faster. Never put an SDS bit in a normal drill chuck, and never put a round masonry bit in a rotary hammer and expect it to survive.

Step bits, hole saws, and other problem solvers

Step bits drill enlarging holes through sheet metal, plastic, and thin panels without grabbing. Hole saws cut large circles for door hardware, recessed lights, and pipe runs, with a pilot bit to keep them centered. Countersinks and counterbores clean up the top of a hole so screw heads sit flush or below the surface. None of these replace a basic twist bit set; they extend what you can do with one.

Matching the Bit to the Material

Wood

Use brad point bits for clean joinery, auger bits for deep bores, and Forstner bits for flat bottoms. Standard twist bits are fine for rough work. The big risk in wood is tear-out, so back the exit side with a scrap board, score the surface with a knife, or clamp a sacrificial block on top. Reduce speed, let the flutes clear chips, and avoid forcing the bit.

Metal

For steel, aluminum, and brass, use HSS twist bits with a 135-degree split point. The harder the metal, the more important slow speed, steady pressure, and cutting oil become. Titanium nitride and black oxide coatings add some life, but they do not make a cheap bit cut stainless steel. Drilling thin sheet metal is easier with a step bit, which resists the grabbing that snaps twist bits in sheet stock.

Concrete, brick, and stone

Carbide-tipped masonry bits in a hammer drill handle small holes in mortar, brick, and block. For real concrete, especially old or reinforced slabs, you want an SDS bit in a rotary hammer. Start the hole with the hammer action off until the bit bites, then switch it on. Never use water to cool a masonry bit; the dust is designed to clear the hole, and water turns it into paste.

A Quick-Reference Table

Pilot Holes, Clearance Holes, and Countersinks

A pilot hole is a smaller hole drilled first so a screw enters without splitting the wood or wandering. As a rule, the pilot should match the screw’s shank diameter, not its threads. In softwood you can often skip the pilot for small screws; in hardwood, composite decking, and any board near an end, drill it every time. If your holes keep wandering even with the right bit, the problem may be chuck wobble rather than the bit itself.

A clearance hole is drilled through the top piece so the screw slides through without biting. When you are joining two boards, drill the pilot in the bottom piece and the clearance hole in the top piece, then the screw pulls the joint tight. A countersink widens the top of the hole into a cone so a flat-head screw sits flush; a counterbore does the same but leaves a flat shelf so the head can be plugged with a dowel.

Speed, Pressure, and Heat

Heat is what kills bits. The harder the material, the slower the bit should spin and the more pressure you should apply. In wood you can run fast and feed steadily; in steel you want low RPM, firm pressure, and a drop of oil; in masonry you want moderate speed and light pressure so the carbide can chip rather than glaze. If you are working with a modern two-speed gearbox cordless drill, keep low gear for metal and masonry and high gear for small holes in wood.

Let the bit do the cutting. Pushing too hard on a small bit bends it, and a bent bit drills an oversized, out-of-round hole. Back the bit out every few seconds to clear chips; packed flutes rub instead of cut and generate heat fast. If the tip changes color, you have already softened the steel, and no amount of sharpening will bring it fully back.

Coatings, Sharpening, and When to Replace

Black oxide holds oil and is a good general-purpose finish. Titanium nitride (TiN) adds surface hardness and lasts longer in metal. Titanium aluminum nitride (TiAlN) handles higher temperatures and is common on better metalworking bits. Cobalt bits are not coated at all; the alloy itself tolerates heat, which makes them the choice for stainless steel and hardened metals.

Twist bits can be sharpened on a bench grinder or with a dedicated drill-bit sharpener, but the angles have to match or the bit will wander. Brad point, Forstner, and masonry bits are generally not worth sharpening at home. Replace a bit when the point is rounded, the cutting edges glint in the light, or it starts needing heavy pressure to cut. For a set that sees regular use, a spare 1/8-inch, 3/16-inch, and 1/4-inch bit saves a trip to the store mid-project.

Common Mistakes to Avoid

• Drilling concrete with a wood bit and burning the tip.
• Running metal bits at full speed and cooking the cutting edge.
• Using a dull bit and blaming the drill.
• Skipping pilot holes in hardwood and splitting the board.
• Drilling through a workpiece without backing up the exit side.
• Forcing a masonry bit through rebar instead of switching to an SDS bit in a cordless hammer drill.
• Storing bits loose in a drawer where they bang against each other and dull.

Frequently Asked Questions

Can I use one drill bit for wood, metal, and concrete?

No single bit does all three well. Twist bits handle wood and light metal, masonry bits are the only safe choice for brick and concrete, and dedicated wood bits give the cleanest holes. Carrying one bit for everything means doing every job badly.

What size pilot hole should I drill?

Match the pilot to the screw shank, the solid core inside the threads, not the outside diameter of the threads. Hold the bit behind the screw; if the shank is hidden but the threads show, the size is right. When in doubt, drill a test hole in scrap.

Why does my drill bit keep wandering on metal?

Usually because the bit is too large for the drill, the speed is too high, or there is no center punch mark. Dimple the metal with a center punch first, start with a small pilot bit, and step up in size. A split-point bit helps because it bites instead of skating.

Do I need a hammer drill for concrete?

For small holes in mortar, brick, or block, a hammer drill with a carbide masonry bit is enough. For structural concrete, repeated holes, or anything larger than about a quarter inch, an SDS rotary hammer is faster and easier on both you and the bit.

How can I tell when a drill bit is dull?

Watch for the point looking rounded and shiny instead of sharp, fine dust instead of chips in wood, and heat building up quickly. A dull bit needs more pressure to cut and gets pushed off line. Sharpening or replacing it is cheaper than ruining the workpiece.

Can I sharpen masonry bits at home?

Generally no. The carbide tip is brittle and the brazed joint is easy to damage with heat. Once a masonry bit stops cutting, replace it. Grinding the tip often leaves the cutting edges uneven, so the bit drills oversized holes.

See Also

• Drywall Anchor Guide: How to Hang Heavy Shelves Safely
• How to Calibrate and Use a Laser Level for DIY Projects
• 10 Most Durable Cordless Drill Drivers Based on Real User Reviews in 2026
• Solving Bit Cam-Out on Compact Drill Drivers
• Cordless Hammer Drills for Concrete Work