Description *6-12mm Hex Handle Vacuum Brazed Diamond Dry Drill Bits Hole Saw Cutter for Granite Marble Ceramic Tile Glass Stone *Wax inside for cooling, Dry drilling without water. *Very high efficiency, multi-purpose drilling. *Long life drilling. Specifications: Hole dirll size: 6/8/10/12mm Material: Diamond Shank: Hexagon Shank Length: 80mm Attention: When using brazed diamond hole saw, the speed of the electric tool should not be lower than 2600 rpm/min, The faster the speed, the better the effect.the hole saw should not be pressed down very hard, otherwise it is easy to damage the hole saw. Package Contents: 1*Drill Bit Note: Please allow minor error due to manual measurement. The colors may be a little different due to different monitor display.