Polishing Burs are excellent for fast contouring and finishing. Ideal for surface characterization and adjusting details. Impregnated with silicone carbide and micrograined aluminum oxide makes for a long lasting, fast cutting and concentric bur perfect for polish on glass and ceramic. Also good for grinding metals. Can be used in place of diamond burs. Notice: Polishing Burs must be run at a lower speed – less than 150,000 RPM.