Introducing DRY WALL SCREWS COARSE THREAD BLACK PHOSPHATE, made with Carbon Steel C1022 for added strength and durability. The Phillips Bugle Head ensures easy installation, and with 48 hours of salt spray testing, these screws are proven to withstand corrosion. Trust the quality and reliability of these screws, made in Taiwan. Available in #6x1 (3.5x25mm) with 900 pieces.