Drill bit

Drill bits are the cutters of drill tools. Bits are interchangeable, meaning that they can be removed from the end of the drill, either to replace a worn part or to change the size of the part.

Auger bit

The cutting principles of the auger bit are the same as those of the brace drill bit above. The auger adds a long deep helix for effective chip removal.

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The bit shown in the picture is a modern design for use in portable power tools, made in the UK in about 1995. It has a single spur, a single radial cutting edge and a single-start thread for its helix. Similar auger bits are made with diameters from 6 mm to 30 mm. Augers up to 600 mm long are available, where the chip-clearing capability is especially valuable for drilling deep holes.

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Image:drill auger.jpg|20 mm auger bit for wood

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Image:drill tip auger.jpg|auger bit tip detail

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