Simpson Strong Tie S16HPTD5 16D Preservative-Treated Wood Decking Nails, 3-1/2-Inch and 8-Gauge, Stainless Steel, 5-Pound, 220-Piece 11/32-inch head diameter and .165-inch shank diameter Ideal for decks and docks Checker pattern on heads to blend with wood grain Annular Ring Shank increases pull-out resisitance Choose 316 Stainless Steel for seaside applications