... ,3/8,15/32,29/64,31/64,1/2,9/16,5/8,3/4 copper plated steel balls G10 ... ,3/8,15/32,29/64,31/64,1/2,9/16,5/8,3/4 copper coated steel balls mild ... .MOQ:1 Chemical :ItemC%Si%Mn%P%S%HardnessAISI 10100.08~0.130.30Max0.50Max0.07Max0.06MaxHRC 58-62 AISI 10150 ...