10 x Diamond Holesaw Tile Glass Slate Porcelain Marble Drill Bits Tool & 15PCS 3-42mm Drill Bit Set
- 25 x hole Opener:10*a + 15*b
- Need Cooling and lubrication.
- Diamond hole saw tile ceramic glass porcelain marble drill.
- Always use lubrication (water) , if not the diamond core will over heat.