Double Hot-Dip Galvanized Asphalt & Fiberglass Shingle Nails are designed for the secure application of asphalt and fiberglass shingles on new construction and re-roofing jobs. Ring and spiral shanks provide extra holding power, especially in high wind/hurricane areas. STORMGUARD Double Hot-Dipped Zinc-Coating provides extra corrosion-resistance. Manufactured to meet ASTM spec. F1667 and ASTM spec. A-153 for hot-dip zinc-coating. Nails should be long enough to penetrate ?? into the wood deck lumber, or completely through plywood decking.