wholesale bearing distributors:1,ABEC-3,5;Z2V2,Z3V3 2,High speed 3,End cover:ZZ,RS 4,Noise level:Z1, ... ,C2, C3, C4, C55),Material: AISI52100, AISI440C, AISI304, AISI316, Ceramic 6),Retainer: PTFE, Nylon, PEEK Or Stainless Steel7),Bore Size:from ...