M10 Diamond Step Drill Bit Set 20mm 35mm 50mm Thread Fit for Drills Angle Grinder Hole Opener Chamfer Polish Countersink for Tile Concrete Marble Granite Stone. Multi-functional application: It integrates the functions of drilling, hole expansion, chamfering, and polishing existing holes.
Item Tag: Diamond Step Drill Bit
2Pcs Diamond Step Drill Bit, 20mm 35mm 50mm Diamond Core Drill Bit Diamond Hole Opener Puncher Round Hole Cone Grinder Bit for Marble Stone Tile Concrete Granite Quartzite, M10 Thread. Multi-functional application: It integrates the functions of drilling, hole expansion, chamfering, and polishing existing holes.