#bore_bit__borer__rock_drill__stone_drill  a drill for penetrating rock
  supertype:  drill  a tool with a sharp point and cutting edges for making holes in hard materials (usually rotating rapidly or by repeated blows)
  subtype:  cross_bit__crossbit  a rock drill having cruciform cutting edges; used in mining
  subtype:  star_drill  a steel rock drill with a star-shaped point that is used for making holes in stones or masonry; it is operated by hitting the end with a hammer while rotating it between blows
  subtype:  straight_flute__straight-fluted_drill  a rock drill with straight flutes

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