bearing: 1.ISO 9001:2000 standard 2.OEM service 3.many years supply bearing 4.wenden original Taper roller bearing1.Types:319series,329series,310series,,320series,330series,322series,332series etc.2.Material:Gcr15-China,(AISI)52100-USA,(DIN)100CR6-Germany3.Retainer:steel cage4.Precision level:ABEC-1,ABEC-3,ABEC-55.Main application: Cylindrical roller bearings is mainly used for medium and large ...