【Package Includes】1pc core drill bit,Diameter 1-3/8”（35mm）,Total Length 60mm,Workable Length35mm,Thread 5/8-11".Diamond grit of the drill bit #35/40；Diamond grit of the finger bit #70/80 【2-in-1 Design】 Diamond core drill bit & diamond finger bit as one piece. This diamond drill bit is designed for Drilling a hole or Bevelling, Enlarging, Grinding and Polishing the exsit holes or shaping edge materials 【Vacuum Brazed Diamond Technology】High-Quality Diamond Powder with Strong Steel Body can bring Excellent Working Performance,High efficiency, longer life 【Materials】Both Dry or Wet use. Suitable for Ceramic Tile, Porcelain Tile, Marble, Artificial Stone, Granite, Stoneware, Microcrystalline stone, Quartz…… 【Machine】Used for angle grinder, the recommend speed is 6,000 RPM, the max speed is 11,000 RPM. If you fit them on hand drill or other machines, you need an adapter, such as SDS, hex, Round plus shank...