... density 4.low noise and low libration HS deep groove ball bearing1.good qualiy,Chrome Steel2.competitive price3.high density4.low ... noise and low libration5.prompt deliveryDeep groove ball bearingWe have Open ,Z,ZZ,RS,2RS,N,NZThe grades ... 6900 seriesModel specifications Packing1). Generally HS Bearing is to be packed in plastic tube, antirust paper, individual paper box , then in ...