Shank: 6mm 8mm 12mm 1/2"(12.7mm). 1PC 3Flutes Countersink Drill Bits 20.5/25/30mm 90 Degree HSS Chamfering Cutter. 6mm-100mm Diamond Hole Saw Cutter Drill Bit Set for Tile Glass Ceramic Marble. High Speed Steel Body.
eBay