Simpson Strong Tie Roofing Tile and Slating nails Annular Ring Shank Type 304 Stainless Steel are available in Copper Aluminum and Stainless Steel. The large flat head provides extra bearing surface to firmly secure roofing material. The annular ring shank increases pull-out resistance to provide a secure attachment to wood members and plywood roof decks. For slate roofs determine the correct nail length by doubling the slate thickness and adding one inch. The longer lengths are ideal for installing curved Spanish roof tiles and thicker slate. Aluminum nails are also available with a screw shank.