ZWZ Bearing ZWZ Bearing is the best bearing in China ZWZ BearingZWZ Bearing is the best bearing in China.It is included:ZWZ Deep ... . Seal form: open style, Z, ZZ, RS, 2RS, 2RZ2. Bearing stop ring: N,NR 3. Class of precision: ABEC-1 ... ,Z4656. Internal elimination code: C0, C2, C3, C4, C57. Bearing material: bearing steel (9Cr18),stainless steel(AISI440C, AISI304, AISI316), ceramics8. Keeper: stainless ...