... ABEC1, ABEC3, ABEC5 3. Z3,Z4 Deep Groove Ball Bearing:1.Chrome steel material Gcr152.Open, ZZ, 2RS3. High accuracy4. ... and non-standard ball bearings.8.Supply ability: 2,000,000 per month MaterialChrome steel Type6000 Series Model ... R166, R168, R188 Other non standard deep groove ball bearings, with inner size over 10mmSealZZ, Z, 2RS, ... , Vacuum Cleaner, Office equipment. Deep Groove chrome Ball Bearing