... ,to be perfectly usable for high-speed dental turbine handpiece Dental ball bearing:Product Specifications*Rings AISI 440C stainless steel: 9Cr18 ... resistant*Perfectly usable for many brands of High-speed dental turbing handpiece, such as KAVO,NSK,W&H,BIEN ... AIR, MIDWEST,STAR,FARO,ADEC,SIEMENS,LARES,etc.Dental bearing size:6.35(1/4") * 3.175( ... 3.175 * 2.787.938 * 3.175 * 2.38 Dental ball bearing