4/6/7/9/12Pcs Brazed Dry Drill Bits Kit M14 Thread Diamond Drill Bit Hole Saw Set Ceramic Tile Granite Marble Hole Opener Tools ,Safety and Durable

15 mm wide cutter head, higher life than the ordinary hole cutter, the opening edge is smoother. Dry drilling without water feeding, it's easier to use The tool head made using vacuum brazing technology allows you to work without adding water. Less Chipping, Minimizing breakage, less heat generation, Better finish quality Standard M14 threaded interface for quick and easy installation. It can also be used with hand drill after installing adapter.Wide application for drilling tile ceramic granite marble stone The tool head made using vacuum brazing technology allows you to work without adding water Less Chipping, Minimizing breakage, less heat generation, Better finish quality