Specifications Diamond burs, drill bits, 2.35mm shank, low speed, made from natural diamond powder. RA / CA 2.35 mm Low Speed Diamond Burs Usage: Dental diamond burs in dental surgeries: 1) Preparation of cavities 2) Treatment of fillings 3) Preparation of crowns they also used as: 1) glass drill bits 2) diamond drill bits 3) jewelry drill bits 4) engraving bits 5) carving bits advantage: 1) Long service life and high cutting capacity when preparing and separating porcelain, facing composites and model materials. 2) Precise dimension and stable control of quality. 3) Enjoy low price but high quality. Packing:10pcs/set