Chrome steel G40 balls For all kinds of ball bearings ... time, and good after-sale service.1. product specification: Chrome steel balls, diameter 2" (50.8 mm) G40, G60 ... 6" (152.4 mm)(3) material Chrome steel: GCr15 , 100 Cr6, 52100(4) hardness HRC 60~64(5) service OEM services ... 86-411-62581257 Fax: +86-411-85502763Mobile NO.: +86 13009476658 Chrome steel bearing balls, diameter 2" (50.8 mm), G40, G60 ...