... /G20/G24/G28/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,G500,G1000,G2000HRC58-62hrcQuality certificateISO ... ,blocks,toys.Any further Information,Plz contact us! G28,G40,G100-G1000 high precision bearing steel balls