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Diameter 8mm,Total Length 60mm,Thread M14 thread,Diamond height 10mm,Max working depth 35mm, Multi-purpose drilling for ceramic tile, porcelain tile, granite, marble…… Wax inside for cooling,our Diamond Tipped Drill Bits have wax cores built-in for Cooling and Lubrication Dry drilling without water,Use water for longer time Machine: Anger grinder. lf you want to use electric drill or other machines, you can use SDS or Hex Shank Adapter. Recommended speed 6000RPM, maximum speed 11000RPM.