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The cutting principles of the auger bit are the same as those of the center bit above. The auger adds a long deep spiral flute for effective chip removal.

Two styles of auger bit are commonly used in hand braces: the Jennings or Jennings-pattern bit has a self-feeding screw tip, two spurs and two radial cutting. This bit has a double flute starting from the cutting edges, and extending several inches up the shank of the bit, for waste removal. The Irwin or solid-center auger bit is similar, the only difference being that one of the cutting edges has only a "vertical flute" supporting it.