... ball bearing,to be perfectly usable for high-speed dental turbine handpiece Dental handpiece bearingProduct Specifications*Rings AISI 440C stainless steel: 9Cr18 ... 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") ...