1,ABEC-3,5,7;Z2V2,Z3V3 2,High speed 3,End cover:ZZ,RS 4,Noise level:Z1,Z2 Z3 5,C2,C0,C3... Features:1),Shield / closure: Open,Teflon Sealed,Rubber Seals,2 Metal Shield2),Tolerance codes: ABEC-1, ABEC-3, ABEC-5, ABEC-73),Vibration level codes: V4, V3, V2, V14),Internal clearance codes: C0,C2, C3, C4, C55),Material: AISI52100, AISI440C, AISI304, AISI316, Ceramic6),Retainer: PTFE, Nylon, PEEK Or ...