What Does a Wood Drill Bit Look Like? Spot Brad-Point, Auger and Forstner Bits

The answer to what does a wood drill bit look like is usually settled in five seconds under a workshop lamp. A sharp centring point sitting below two raised spurs means brad point. A tapered screw thread at the tip means auger. A flat steel ring with a fine knife edge and a shallow body means Forstner. A hollow square tube with a small auger turning inside it means mortise chisel. The handle, the paint and the packaging change none of that.

That quick check earns its keep. Wood bits share drawers with twist bits for metal, carbide-tipped masonry bits and budget spade bits, and picking the wrong one costs more than a slow cut. A metal bit pushed into oak at high speed burnishes the hole wall and loses its edge within minutes. A masonry bit crushes timber fibres instead of slicing them and leaves a ragged, oversized hole that no dowel will hold. Reading the geometry is the cheapest way to avoid both mistakes.

Anyone asking what does a wood drill bit look like is really asking a practical question: which bit is in my hand, and what was it built to do? Our wood drill bit guide sorts this family by material. This article sorts it by sight, feature by feature.

What Does a Wood Drill Bit Look Like? Four Features That Settle It

A wood drill bit is identified by four visible features: the tip geometry, the spurs or rim, the flute pattern and the shank. Read them in that order and a brad point will never be mistaken for a twist bit again.

The tip carries the most information

Work down from the point. The tip shape names the family before any other feature does.

• Brad point: a sharp centre point with two raised spurs, or nickers, on the shoulders.
• Auger: a coarse tapered lead screw that bites into the timber and pulls the bit forward.
• Forstner: a small centring point or screw set behind a circular cutting rim.
• Spade or flat bit: a flat paddle with a small pyramid point and no rim at all.
• Square-hole bit: a hollow four-sided chisel with a small auger spinning inside it.

The flute pattern shows what the bit was built to clear

Timber produces long stringy chips, and flute count is how a maker buys clearance for them.

• Single flute: one deep channel, slowest feed, cleanest wall.
• Double flute: two channels that move chips faster on deep holes.
• Tri-flute and four-flute: the fastest evacuation, usually paired with a lead screw on ship and boarding augers.
• No flute: Forstner-style bits shear the rim and scrape the waste out with the body.

The shank and the finish tell you which machine it belongs in

Round shanks fit a three-jaw chuck, hex shanks fit quick-change holders and impact drivers, and a fat welded carbide insert means the bit is for masonry rather than timber. A bright polished body with a black oxide or lacquered finish is normal for wood bits. A plain twist body with a point angle between 118 and 135 degrees is a metal bit, and no amount of sharpening will make it cut clean timber.

Brad-Point Wood Bits: The Spur Is the Giveaway

A brad point looks like a twist bit that grew teeth. Two raised spurs sit on the shoulders either side of a sharp centring point, and those spurs do the real work: they score the fibres in a clean circle before the cutting edge lifts the waste out, which is why the entry hole in veneered ply or oak shows almost no tear-out.

Spur condition is the first thing to inspect on a used bit. A chipped or rounded spur still drills, but the surface fibres tear and the hole edge turns fuzzy. Extension versions carry the same geometry on a longer shaft, so a 250 to 400 mm extended brad point reaches through thick stock from one side instead of forcing you to flip the workpiece and risk a misaligned exit hole.

Standard Brad Point Wood Bit with Precision Center PointStandard brad point wood bit with a precision center point, single land and round shank, available in a range of marked dimensions for wood drilling.View Product →

Auger Bits: Screw Tips and the Deepest Flutes

An auger is the only common wood bit with a screw at the tip, and that screw makes it recognisable at arm's length. The lead screw threads into the timber and drags the cutting head forward, so the operator supplies rotation rather than feed pressure. The result is a fast, self-feeding cut that clears long chips from a hole many times deeper than the bit's own diameter.

Flute count separates the sub-types. A single-flute auger has one wide polished channel and leaves the cleanest wall. Double-flute and tri-flute versions evacuate chips faster and suit production boring. A bellhanger bit adds a cross hole through the tip so cable can be threaded straight into a wall cavity, while ship and boarding augers use a coarser screw and a heavier body for wet timber and framing work.

Custom Single Flute Auger Bit with Self-Feeding Screw PointSingle-flute wood auger bit with a self-feeding screw point, wide lands and hex shank, offered in multiple lengths, diameters and shank finishes.View Product →

Forstner and Square-Hole Bits: Rim Cutters and Hollow Chisels

A Forstner bit looks like a short steel cup with a knife edge around its mouth. The rim shears the fibres around the perimeter, the flat body scrapes the waste towards the centre, and the result is a flat-bottomed hole whose wall sits square to the surface. That geometry is why cabinetmakers reach for one when fitting hinges, sinking a recess or cutting plugs.

Square-hole bits are a two-part tool. A hollow, four-sided chisel cuts the outer walls while a small auger inside removes the core, which turns a round drilling motion into a square mortise. They belong on a mortiser or a drill press with a chisel holder, not in a hand drill, because the chisel must enter and leave perfectly vertical.

Custom Screw Point Forstner Bit for WoodworkingScrew-point Forstner bit with a replaceable tooth tip for fast boring in wood, cork, cardboard and MDF, listed in diameters up to 117 mm.View Product →

What Does a Wood Drill Bit Look Like Compared With Metal or Masonry Bits?

Wood bits are the only family with a low point angle, a wide open flute and a tip made entirely of hardened steel with no insert. Metal bits keep the twist body but narrow the flute and open the point to 118 or 135 degrees, while masonry bits end in a welded carbide tip that is wider than the body itself.

What Bulk Buyers Check Before Wood Drill Bits Ship

Importers judge a wood drill bit programme on repeatability rather than on a drawing. Four checks decide most orders.

1. Spur symmetry and point concentricity, measured on a sample from every batch instead of the first article alone.
2. Flute polish and chip clearance, because a rough flute packs with resin and scorches the hole wall.
3. Shank hardness and brazing quality, the point where a chuck jaw spins a soft bit.
4. Diameter marking and drill index layout, since the end user reads the packaging before the bit.

Zhejiang URUS Tools Co., Ltd. manufactures wood, metal and masonry drill bits alongside pliers and cased tool sets from its plant in Jiashan, Zhejiang. The company holds ISO 9001:2015 certification, operates a TUV Rheinland cooperative testing laboratory, exports to Japan, Europe and the United States, and runs OEM and ODM programmes for buyers who need their own brad-point, auger and Forstner line-ups.

FAQ: Telling Wood Drill Bits Apart at a Glance

How can I tell a wood drill bit from a metal bit without a label?

Look at the point first. A wood bit has a low point angle plus spurs, a lead screw or a cutting rim, and a wide open flute sized for stringy chips. A metal bit has a plain conical point of 118 to 135 degrees and a tight spiral flute built for short brittle swarf.

What does a brad-point wood bit look like at the tip?

Two raised spurs sit on the shoulders either side of a sharp centre point, so the tip looks like a small crown. Those spurs score a clean circle in the surface before the cutting edge lifts waste, which is what keeps the entry hole free of tear-out.

Why does my wood bit have a screw thread at the point?

That is an auger. The lead screw threads into the timber and pulls the bit forward, so you control rotation rather than feed pressure. It is the reason augers bore deep, straight holes quickly in framing and cable work.

Can a wood drill bit be used on metal or masonry?

No. A wood bit's low cutting angle and wide flute are wrong for metal, and its hardened steel tip will dull or chip on stone. Use a metal bit for steel and a carbide-tipped masonry bit for brick, block and concrete, and keep wood bits for timber.