Features:_x000D_ _x000D_ Imported silicon carbide, high-accuracy grinding technology, strongly resistant to wear, fast and efficient opening. _x000D_ The drill body comes with high-temperature wax, which can cool the lubrication bit and achieve no water punch. _x000D_ Anti-skid shank, suitable for drilling equipment such as hand drill angle grinder. _x000D_ Suitable for full ceramic tile, vitrified tile, ordinary glass, ceramic, marble, granite, microcrystalline stone, quartz stone. _x000D_ We provide 5 kinds of drill bit of different sizes for you to choose from. _x000D_ _x000D_ Specification:_x000D_ Item Type:Drill Bit_x000D_ Material:Diamond_x000D_ Total Length:65mm/2.6in_x000D_ Cutting Diameter:6mm / 0.24in 8mm / 0.31in 10mm / 0.39in 12mm / 0.47in 14mm / 0.55in(Optional)_x000D_ Effective Length:6mm / 0.24in 8mm / 0.31in 10mm / 0.39in 12mm / 0.47in 14mm / 0.55in_x000D_ Application Equipment:Angle grinder, hand drill_x000D_ _x000D_ Package List:_x000D_ 1 x Drill Bit_x000D_ _x000D_ Note:_x000D_ 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._x000D_ 1. Install the drill bit on a hand drill or an angle grinder._x000D_ 2. Tilting angle when positioning. After the groove appears, it will turn positive again._x000D_ 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!