A multipurpose screw fine thread for smooth driving and greater holding power in wood and 20 to 25-gauge metal studs. Standard bugle head No. 2 Phillips recess phosphate finished screw. Can also be used for drywall hardware plywood and softwood. 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. Warning: Cancer and Reproductive Harm. www.P65warnings.ca.gov - Nickel (Metallic)