... and sizes 1)with one or two sides ruber seal RS,2RS 2)With one or two sides metal shieldsZ,ZZ ... of CIE bearingRing MaterialGCr15, GCr15SiMn, Bearing steelCagesteel cageQuality standardISO9001:2000PrecisionP0, P3,P4,P6,P5ClearanceC0,CM,C2, C3, C4Vibration & NoisyZ1,Z2,Z3 V1 ...