Designed for the secure application of asphalt and fiberglass shingles on new construction and re-roofing jobs. STORMGUARD® Double Hot-Dipped Zinc-Coating provides extra corrosion-resistance in sea coastal areas. Manufactured to meet federal spec. ASTM F1667 and ASTM spec. A-153 for hot-dip zinc coating. Nails should be long enough to penetrate 3/4" into the wood deck lumber, or completely through plywood decking. All Maze Nails are 100% Made in the U.S.A.