... steel,Stainless steel,Alloy steel,Copper,Aluminum are available.Carton steel is high quality iron,such as 1022,1018,1010,1008,1015...Medium carbon steel ... ,Combined type...FinishZinc plated,Nickel plated,Dacroment Plated,chromium plated,Tin plated,Blackphosphating ,anodized ,and Environmental Plated is used in ... manufacturer with more than 20 years experiences in screw,bolt,nut,washer,rivet, stud, pin, ...