Simpson Strong Tie S1010ARN1 10D Roofing Tile and Slating Nails 3-Inch and 10-Gauge, Ring Shank, Stainless Steel, 1-Pound, 78-Piece 3/8-inch head diameter and .134 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