... -sale service.1. product specification: Chrome steel balls, diameter 2" (50.8 mm) G40, G60 grade(1) precision G28, G40, G60(2 ... ) process range from 3/4" (19.05 mm) to 6" (152.4 mm)(3) material Chrome steel: GCr15 , 100 Cr6, 52100 ... -85502763Mobile NO.: +86 13009476658 Chrome steel bearing balls, diameter 2" (50.8 mm), G40, G60 grade balls