Simpson Strong Tie S8PTD1 8D Preservative-Treated Wood Decking Nails 2-1/2-Inch and 11-Gauge, 304 Stainless Steel, 1-Pound, 115-Piece 9/32-inch head diameter and .120-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