... 2mm-60m Bearing steel ball Production nameG28,G40,G100-G1000 high precision bearing steel balls size2MM-60MMGradeG28,G40,G80,G100,G200 ... G500,G1000,G2000HRC58-62hrcQuality certificateISO 9001:2008/SGS test report/ROHS report GradeAvailable Size RangeDiameter tolerance(μm)Deviation from Spherical Form ... ,nipples,sliding,blocks,toys.Any further Information,Plz contact us! High Quality Bearing Steel Balls