#drilling_bit__drill_bit__drillbit  a bit used in drilling for oil
  supertype:  #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"
  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

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