Hot-Dipped Galvanized Roofing Nails for applying roofing asphalt shingles, insulation board, and felt-to-wood substrates. Large head and heavier shank gauge provide greater holding power. Electrogalvanized nail also appropriate for use with vinyl siding. For attaching copper flashing and other decorative copper roofing elements. Large head for greater holding power. Smooth shank for ease of penetration.