drill bit

noun
bit1 ( defs 1a, b ).
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Of course, the first vibrations of a drill bit would set off the embedded
  seismic alarm anyway.
Workers drilling at the site said they also found a sheet of gold wrapped
  around the drill bit when they withdrew it.
Use a drill bit slightly smaller in diameter than the nail.
The drill bit and rods are removed and what is left is a self-supporting, open
  rock borehole.
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