Metal Cutting Burs (Tungsten Carbide). Particularly appropriate for crown & bridge cutting as well as for amalgam or composite removal. The best-seller in its category: the TRANSMETAL bur. Specially designed to cut and perforate crowns & bridges (gold and Ni-cr or other non precious alloys). Helicoid tooth pattern with extra fine cross-cutting: good debris evacuation (no bur clogging and therefore no overheating of the bur).