Can be used for drywall, hardware, plywood, composition, and softwood. Sharp point, coarse thread with a No. 2 Phillips recess, bugle head. Phosphate finish. For interior use. This screw is constructed of hardened steel which is the result of carbon steel being put through heat treatment, quenching, and further reheating making it extremely durable. Hardened Steel is more resistant to wear, corrosion, and abrasion.