1. Insert Ball Bearing with Collar four-star, with the top wire ball 2.Material:Chrome Steel, 3.High quality&Fast ... Factory Insert Ball Bearing with Collar four-star, with the top wire ball Specification:1.Bore diameter: from 12mm to 140mm ... )100Cr6--Germany4.Certificates:ISO9001:2000,ISO/TS169495.Feilds Used in: Motorcycle, Motor, Pump, Fan, Air conditioner, Microwave Oven ,Sewing Machine, Massage ...