... chrome steel Gcr15 3. low noise 4. high precision bearing Description Products NameTaper roller bearing 30210,NU205,NU1000,NU300,NU400Basic informationinner diameter:50mmouter ... roller bearing,Double-row taper roller bearing,Four-row taper roller bearing,auto bearing,Machine-tool bearing,Construction bearing ,Heavy-duty bearing ,tapered roller bearing ,agriculture machine bearing.bearing ...