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WQK deep groove ball bearings 1) Standed as the famous brands 2) Precision: P0,P4,P5,P6 3) Vibration: V1,V2,V3,V4 4) Clearance: C2 C3 C4 C5. 1) High quality with low price. 2) ISO 9001 approved. 3) Long life and low noise.