Diamond Core Drill Bits, Set Of 6 | DIB-500.00 Great for drilling holes in ceramic, tile, glass and other jewelry components Made of stainless steel with electroplated diamond particles 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