Collated Screws(drywall screws,fasteners) Material: Carbon Steel Standard: DIN, JIS, BS, ANSI/ASME High quality Collated Screws(drywall screws,fasteners)Material: Carbon SteelStandard: DIN, JIS, BS, ANSI/ASMEFinishing: Black Phosphated, Gray Phosphated, Plain, Blue Zinc Plated, Color Zinc Plate Collated screw