1/16,3/32,1/8,5/32,3/16,7/32,1/4,5/16 copper plated steel balls G10 ... 1/16,3/32,1/8,5/32,3/16,7/32,1/4,5/16 copper coated steel balls mild ... /32" 3/16" 5/16" 5/32" 7/32" 1/4" 3/8" -7/8" 1/2" 1"4. Hardness: 58-62HRC5 ... .500.10~0.300.60~0.900.04Max0.05MaxAISI 10850.83~0.880.10~0.300.30~0.700.04Max0.04Max ...