1/16,3/32,1/8,5/32,3/16,7/32,1/4,5/16 copper plated steel balls G10 G16 G100 G1000 ... chrome steel 1/16,3/32,1/8,5/32,3/16,7/32,1/4,5/16 copper coated steel balls mild ... to 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 ... .04Max0.04Max 1/16,3/32,1/8,5/32,3/16,7/32,1/4,5/16 copper plated AISI52100 steel balls