Hand piece bearing is miniature ball bearing,to be perfectly usable for high-speed dental turbine handpiece Dental bearing:Product Specifications*Rings AISI 440C stainless ... -temperature 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(1/8 ...