PTN158S1 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.-1-5/8".-1 lb box. Warranty: -10-year warranty against rust and corrosion.