Transmetal cylinder bur recommended for cutting crowns and bridges (gold, nickel-chromium and other non-precious alloys). The active axial part is applied to the surface to be cut with moderate pressure. An alternating up and down movement improves the efficiency of the bur.Recommended speed: between 120,000 and 180,000 rpm. Spiral drill with extra-fine cross cut guaranteeing effective debris removal (no accumulation), hence preventing heating.