... G100 G1000 AISI52100 chrome steel 1/16,3/32,1/8,5/32,3/16,7/32,1/4,5/16 copper coated steel balls mild ... G10003. Size: 1/8" 5/32" 3/16" 5/16" 5/32" 7/32" 1/4" 3/8" -7/8" 1/2" 1"4. Hardness: 58 ... .50Max0.07Max0.06MaxHRC 58-62 AISI 10150.13~0.180.10~0.300.30~0.600.04Max********AISI 10450.43~0 ... .500.10~0.300.60~0.900.04Max0.05MaxAISI 10850.83~0 ...