... G100 G1000 AISI52100 chrome steel 1/16,3/32,1/8,5/32,3/16,7/32,1/4,5/16 copper coated steel ... " 3/16" 5/16" 5/32" 7/32" 1/4" 3/8" -7/8" 1/2" 1"4. Hardness: 58-62HRC5. Packing: Bag/Carton6. Brand ... :Ball king7.MOQ:1 Chemical :ItemC%Si%Mn%P%S ... .30~0.700.04Max0.04Max 1/16,3/32,1/8,5/32,3/16,7/32,1/4,5/16 copper plated AISI52100 ...