... G40/G60/G100/G200 3,size:2mm-60m Bearing steel ball Production nameG28,G40,G100-G1000 high precision ... bearing steel balls size2MM-60MMGradeG28,G40,G80,G100,G200, ... RangeDiameter tolerance(μm)Deviation from Spherical Form(μm)Lot Diameter Variation(μm)Ra(μm)101/16”~1”0.250 ... Information,Plz contact us! AISI52100 ,GCR15,100Cr6 chrome bearing steel balls