... Roller Bearing:1.Less coefficient of friction, High limiting speed, Large size range, Variations of structure.2.Tapered Roller Bearings are designed ... ,JLMS,LS,LM,LMS,MS,HMS seriesMaterialGCr15CertificateISO9001:2001PrecisionP0, P5, P6Bore Size:20mm-190mmOutside diameter40mm-320mmClearanceC0,C1,C2,C3,C4,C5 etc ...