... Roller Bearings 1.High precision & quality 2.ISO 9001 certified 3.Low noise,Stable in chemical stable and super quality Taper Roller Bearings Material ... -12); Knuckle Upper Lower XRM(Lower H27-48.5-15, Upper H26-48.5-13), etc Specification:1) Open, Z, ZZ, RZ ... ,2RZ,RS, 2RS 2) Clearance: C0, C2, C3 3) Precision ...