#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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