Hole Counter Sink Drill Bit – DiamondCore Tools
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Hole Counter Sink Drill Bit 25 mm - 180 Grit


This Hole Counter Sink Drill Bit is designed to create, enlarge, shape, trim, and finish holes in ceramics, porcelain, tile, glass, and more. Use the specialized shape with a drill to create a chamfered 45-degree edge around a hole up to 25 mm in diameter. This diamond grit bit is incredibly long-lasting with proper use.


  • Hole counter sink drill bit made of diamond grit and metal
  • 25 mm width X 15 mm length tapered cone shape
  • 8 mm shaft
  • 180 grit


  • Creates conical holes up to 25 mm
  • Works on tile, stone, or glass
  • It can also grind away glaze drips, bisque, or high-fired ceramic
  • Remove sharp edges
  • Shape or cleanup bisque spots
  • Remove kiln shelf debris


  • It can be used wet or dry
  • Controls dust when used with water


  • Use all safety precautions
  • Keep out of the reach of children  

Note: For longevity, use water, high speed, and gentle pressure. Overheating the tool will greatly decrease tool lifespan and change the tool shape.