... Diameter:90mmWidth:23mmWeight:0.568KGS1.Material : Gcr15(Chrome steel)--China,(AISI)52100---American ,(Din) 100Cr6---Germany 2.Precision ... machine,Massage Chairs,Textile machinery, Electric tools,Agriculture machinery ,Fitness equipment , Washing Machine,Vacuum Cleaner,Office equipment 4.Certificates: ISO 9001 ... cone angle (more sustain of axial load). China High Quality 32011 Taper Roller Bearings