Simpson Strong Tie S8SN71 8D Shake and Shingle Siding/Roofing Nails 2-1/2-Inch and 13-Gauge, 304 Stainless Steel, 1-Pound, 196-Piece 7/32-inch head diameter and .095 inch shank diameter Slender shanks minimize splitting Checker pattern on heads to blend with wood grain Annular ring shank increases pull-out resistance Choose type 316 for seaside applications and superior corrosion resistance