Expertly crafted in Taiwan, these DRY WALL SCREWS COARSE THREAD BLACK PHOSPHATE are made from Carbon Steel C1022 for unmatched strength and durability. The Phillips Bugle Head design allows for effortless installation. Plus, after undergoing 48 hours of salt spray testing, these screws have been proven to resist corrosion. You can trust in the impeccable quality and dependability of these #6x1 (3.5x25mm) screws, available in a pack of 900.