#bit.cutting_implement  the cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press; "he looked around for the right size bit"
  supertype:  cutting_implement__cuttingimplement  a tool used for cutting or slicing
  part:  shank
  part of:  drill  byte
  subtype:  bur__burr  small bit used in dentistry or surgery
  subtype:  center_bit__centre_bit  a bit with a sharp center point for guidance and two side cutters
  subtype:  chamfer_bit  a bit that is used for beveling
  subtype:  counterbore__countersink__countersinkbit  a bit for enlarging the upper part of a hole
  subtype:  drilling_bit__drill_bit__drillbit  a bit used in drilling for oil
     subtype:  core_bit  an annular drilling bit to allow core samples to be taken
     subtype:  fishtail_bit__blade_bit__bladebit  a drilling bit with cutting edges usually hardened against wear
     subtype:  rock_bit__roller_bit  a drill bit that has hardened rotating rollers
  subtype:  expansion_bit__expansionbit__expansive_bit__expansivebit  a bit with a cutting blade that can be adjusted to different sizes
  subtype:  pilot_bit__pilotbit  a small bit that drills a first hole to guide a larger drill
  subtype:  spade_bit__spadebit  a thin bit with a center point and cutting edges on either side
  subtype:  twist_bit__twistbit__twist_drill  a bit or drill having deep helical grooves

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