Type 18-8 stainless steel has a high resistance to rust and corrosion and may be mildly magnetic. For salt water or coastal environments type 316 stainless is highly recommended. Our bugle style deck screws have a square drive and a curved/tapered neck so that the screw will finish flush with the surface. The length of a deck screw is determined by measuring the entire screw (top to bottom). Click on each size category below for more information.