Features: Imported silicon carbide, high-accuracy grinding technology, strongly resistant to wear, fast and efficient opening. The drill body comes with high-temperature wax, which can cool the lubrication bit and achieve no water punch. Anti-skid shank, suitable for drilling equipment such as hand drill angle grinder. Suitable for full ceramic tile, vitrified tile, ordinary glass, ceramic, marble, granite, microcrystalline stone, quartz stone. We provide 5 kinds of drill bit of different sizes for you to choose from. Specification: Item Type:Drill Bit Material:Diamond Total Length:65mm/2.6in Cutting Diameter:6mm / 0.24in 8mm / 0.31in 10mm / 0.39in 12mm / 0.47in 14mm / 0.55in(Optional ) Effective Length:6mm / 0.24in 8mm / 0.31in 10mm / 0.39in 12mm / 0.47in 14mm / 0.55in Application Equipment:Angle grinder, hand drill Package List: 1 x Drill Bit Note: After punching out the positioning groove, slowly drill the electric drill and shake it while punching holes, which makes it easier to discharge the debris and increase the punching speed. It is forbidden to press the vertical hard top and press hard, otherwise it will greatly shorten the service life. 1. Install the drill bit on a hand drill or an angle grinder. 2. Tilting angle when positioning. After the groove appears, it will turn positive again. 3. The faster the hand drill speed, the more the number of holes, the high power hand drill is recommended. Do not use lithium drills, ordinary impact drills and low-speed hand drills. It is recommended to use more than 3000 speeds