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Diameter 20MM;Workable Width 20mm;Total Length 40mm.Chamfer angle: top angle 56 degree; Grit:#80.Recommend RPM: 6000-11000RPM.Used on M14 angle grinder. Not for drilling holes, but designed to enlarge, shape, polish, clean, trim, finish, round or bevel existing rough holes of marble ceramic porcelain tiles granite. Diamond grit #80 is sharper. It helps to reduce the risk of tile cracking when under tension and clean the holes. Wet or dry use. Vacuum brazing technology keeps premium diamonds more firmly and durable. best work effect and longer life. As a saving-money tool,just one standard core bit and this versatile milling bit/diamond cones beveling bit,many holes of different sizes can be created from 5mm-20mm.