For Grinding of all-ceramic restorations. Friction grip with special reinforced coating to ensure permanent bonding of the diamond grains. Head Diameter size = 012 (1.2mm). Working Length of Diamond Grit Part = 8mm. Due to the high-torque forces in Crown-cutting the bur is recommended for use in Redbands (instead of lower-torque performing air Turbine Highspeeds) at the optimal speed of 160,000rpm. Friction-Grip