Simpson Strong Tie S511ARN5 5D Roofing Tile and Slating Nails 1-3/4-Inch and 11-Gauge, Ring Shank 304 Stainless Steel, 5-Pound, 745-Piece 11/32-inch head diameter and .120-inch shank diameter Large flat head provides extra bearing surface Annular ring shank increases pull-out resistance Longer lengths ideal for installing curved Spanish roof tiles and thicker slate Aluminum nails also available with screw shank