Shape: Torpedo, Conical Roughness: Extra Coarse Head Dia (mm): 1.8 Pieces per pack: 5 Pieces per pack: 5 BENEFITS OF DIAMOND BURS: This product has a stainless steel working part that is coated with natural diamonds. It is used as a grinding instruments on hard tissues such as teeth and bones. It can also be used for grinding metal, plastic, porcelain, and other hard materials. FG stem design for multi-use diamond bur applications. Quality control tested for High precision results.