products No.:Carbon steel bearing 625, 626, 607,608, 6000and so on Deep Groove Ball Bearing Features: 1) Series: 60 2) End cover: open, ZZ, or RS 3) Material: Cr steel or stainless steel 4) Vibration and noise level: Z1, Z2, Z3 5) Precision level: P0, P6, P5 (ABEC1, ABEC3, ABEC5) 6) Radial clearance can be made according to clients' needs