Simpson Strong Tie S410ARN1 4D Roofing Tile and Slating Nails 1-1/2-Inch and 10-Gauge, Ring Shank 304 Stainless Steel, 1-Pound, 139-Piece 3/8-inch head diameter and .134 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