ITEM NAME:5x 6mm Diamond Drill Bit Brazing Tools Glass Porcelain Marble Tile Stones Description: Please add water for coolant and drill slowly. Start drill at 45 Degree to surface and align to 90 Degree as hole forms. Never use drills while machine is in hammer action. Holes require no futher work as cutting is clean. Suitable for various stones, ceramic, vetrified tiles, glass, marble etc. Specification: Material: Diamond Total Length: Approx. 6.5cm / 2.56inch Top Shank Diameter: 6mm / 0.24inch Tapping Diameter: 6mm / 0.24inch Color: Red Package Includes: 5 Pieces Drill Bit Note: Please allow 1-3mm error due to manual measurement, make sure you do not mind before you.Suitable for various stones, ceramic, vetrified tiles, glass, marble etc. Start drill at 45 Degree to surface and align to 90 Degree as hole forms. 5 Pieces Drill Bit. Material: Diamond. Color: Red.