... Fasteners 3. Customer First,Service Fi All kinds of Self Drill Screw • Material: Carbon steel & stainless steel• Head style: various• Size ... plated (trivalent chromium or sexivalent chromium), nickel plated, oxidation plated, plain finish , Black Oxide • Plating:BlackOxide,Zinc,Chrome,Galvanized,Nickle,Dacromet ...