... ---Germany4)Shield/Closure:Plain(Open),Z,ZZ,RS,2RS,UG.5)Vibration and Noisy level: Z1,Z2,Z3,ZV1,ZV2.ZV3 ... .Z2V2.Z3V3.6)Precision level:ABEC-1,ABEC-3,ABEC-5.7)Fields Used in : Motorcycle , Motor , Pump ,Fan,Air conditioner ... Without Snap Ring Groove;4. Precision Grade: P0, P6, P5, P4;5. Clearance Grsde: C2, C0, C3, C4, C5;6. Vibration Grade ...