Grip-Rite PTN4S1 4-Inch 10 Coarse Thread Exterior Screw with Bugle Head, 1 Pound
Outdoor construction exterior screws, PrimeGuard Plus Ten has a ten-year warranty against rust and corrosion including when used in treated lumber. For outdoor projects including decks and fences.  PrimeSource Building Products, Inc. is the largest purveyor of fasteners in the world and one of the largest distributors of building materials in the United States.