... P4 3.Long working life 4.High speed Dental handpiece bearingBearing feature:1.Material: AISI 440C, 9Cr18 stainless ... resistant Application: For high-speed dental turbine handpiece, such as KAVO,NSK,W&H,BIEN AIR, MIDWEST,STAR ... ,FARO,ADEC,SIEMENS,LARES,etc. High speed dental handpiece ... #10Grooved 3.1755.972.786.351.781W&H KaVo 624/625/630/640 - 647/649/650Flanged3.1756 ...