Our diamond-coated core drills have a 3mm (1/8 in.) shank, medium-fine grit and are made of stainless steel on which diamond particles have been electroplated.            

Great for drilling holes in ceramic, tile, glass and other jewelry components

• 6 piece set including 1.5, 2.0, 2.5, 3.0, 5.0, 6.5 millimeters
• 3 millimeter (1/8 inch) shank
• Medium-fine grit

Diamond drill bits are designed to be used at 5,000-15,000 rpms for best results.

Always use a lubricant or water when working with diamond coated instruments