For a long time, the H4MC was the first choice for separating ceramic veneers and metal crowns; however, over the years, the active part of the H4MC has grown larger and larger, even the active part of the H4MCXL seemed too short to some professionals. ISO: 102 - Maximum Speed: 300,000 rpm - Shape: ROUND-CYLINDRICAL Diameter 014 - Shank: TURBINE - Grit Type: - Application: Crown cutting - Packaging Quantity: 1 pc.