Countersink Bits


RUKO countersink bits now include bits to accommodate UNC or inch fasteners. The round shank, 82-deg taper countersinks are CBN ground from fully hardened, high-speed steel blanks, which create a sharper and more durable cutting edge with precise tolerances. Combined with axial relief grinding, this guarantees a smooth, low-heat, chatter-free cut up to 30% faster than competing countersink bits.

Available diameter sizes range from 1/4 to 1 in.; bits come in individual pieces opr a five-piece set.


RUKO countersinks are suitable for standard industrial materials such as:

  • steel
  • cast iron
  • stainless steel
  • non-ferrous metal
  • thermoplastics
  • duroplastics
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