... perfectly usable for high-speed dental turbine handpiece dental drill bearingProduct Specifications*Rings AISI 440C stainless steel: 9Cr18 ... *Rotating speed 350,000-450,000 rpm under air-pressure of 200-250Kpa*Working life about six ... handpiece, such as KAVO,NSK,W&H,BIEN AIR, MIDWEST,STAR,FARO,ADEC,SIEMENS,LARES,etc.Dental ... * 3.571(9/64")7.938 * 3.175 * 2.787.938 * 3.175 * 2.38 Dental Drill Bearing