... 9001:2000 Factory 2. ABEC1, ABEC3, ABEC5 3. Z3,Z4 Deep Groove Ball Bearing:1.Chrome steel material Gcr152.Open, ZZ, 2RS3. High accuracy4 ... Model:R2-R24, R156, R166, R168, R188 Other non standard deep groove ball bearings, with inner size over 10mmSealZZ, Z, 2RS, RS, OPEN ... , Agriculture machinery, Fitness equipment, Washing Machine, Vacuum Cleaner, Office equipment. Deep Groove chrome Ball Bearing