GRT1188 Features: * Exterior screws * For use in exterior applications and with all treated lumber * Tannic acid found naturally in lumber can cause staining and streaking * The use of PrimeGuard Plus stainless steel fasteners is recommended for all outdoor projects * Use for docks, piers, or within 5 miles of the coastline * Ten/Phillips head * 3"" * 1 lb box Warranty: * 10-year warranty against rust and corrosion