10PCS Diamond Coated Hole Saw Core Drill Bit Tile Marble Glass Ceramic Drill Bit
10PCS Diamond Drill Bits. Use a Low Speed Setting and Proper Cooling, Such as Water, to Ensure Longer Lasting Life. Material: Electroplated diamond. 8mm/0.31 ", 10mm/0.39 ", 12mm/0.47 ", 18mm/0.71 ".