- The Transmetal Bur is a carbide bur. - Its extra-fine crosscut shape is designed to remove an old amalgam filling or to cut through porcelain fused to metal crowns without shattering the porcelain or damaging the bur. - Diameter of the working part (1/10mm): 012. - Length of the working part: 4 mm. **For further product information, please contact Chat Support**