Raizi 5/8-11 Vacuum Brazed Diamond Tile Core Drill Bits As a diamond coring&drilling tool, Raizi diamond core drill bit features comparable quality with RUBI, but more cheaper price. The vacuum brazed diamond tile core drill bit is designed for coring and drilling ceramic tiles, porcelain tiles, and other material such as marble, granite and concrete.  Lateral opening sesign will cool the drill and remove solid residues after each drilling, Diameters are available in 20-68 mm, which is designed for drilling water tapping points, sewers, electrical connections, etc.These 5/8"-11 thread vacuum brazed diamond tile core drill bits are used on angle grinder. Also with our 10 mm Hex Shank drill adapter, it is ideal for power drill. Specification: Diameters：20-68 mm 5/8"-11 thread connection Dry Work Only Average Life: 50-60 holes Minimum Work Speed: 10000 rpm Diamond Height: 10 mm Machine: Angle Grinder Application:ceramic tiles, porcelain tiles, marble, granite and concrete Bister Package Note: The average life of the tile drill bit depend on the type of material, thickness, proper cooling and user. Confirm the suitable rotation speed and perform a slight orbital movement while drilling Before futher drilling, we must ensure that the drilling bit is clean and free of any obstruction.