1)bolts/non-standard bolts/bolts for autos 2)high precision 3)quality be assured 4 ... ,Auto-Turning machines,bending machines,stamping equipment for carbon dioxide gas arc welding and argon-arc ... welding 2)Material: iron, carbon steel, stainless steel, alloy ... E-coating, Silkscreen, Heat treatment, Black oxid standard metal stamping stamped nut bolts for autos