... 4.Retainer: nylon PA66 5.Usage: auto water pump Features of auto water pump bearings:1) Usage: auto water pump2) Material: Gcr153) Shield ... ) Vibration and norse level: V2, V1, Z1, Z26) Tolerance: ABEC-1 (P0)7) Internal clearance: Co, C2, C38) Hardness: shaft-58 ... ) Packing method: individual plastic bag/plastic tube + carton + pallet all series of WR WB auto water pump bearings