... 3. Customer First,Service Fi 2013 Largest Of Sale Drywall Screw • Material: Carbon steel & stainless steel• Head style ... oxidation plated, plain finish • Plating:BlackOxide,Zinc,Chrome,Galvanized,Nickle,Dacromet, Delta-Tone, Geomet,Ruspert• Packing: AS ... :ISO, DIN, ANSI, JIS, BS, Non-standardSurface :Galvanized (Various of color), dacromet, blackened, phosphatingCertificationISO/TS16949,ISO9001, ...