The 1-1/4" Electro Galvanized Smooth Shank Coil Roofing Nails (7,200 nails per carton) are ideal for securely fastening synthetic underlayment, insulation board, and metal shingles to roof decks. These nails feature a smooth shank design for efficient penetration, and the electro-galvanized coating provides enhanced corrosion resistance, ensuring long-lasting durability in various weather conditions. Perfect for professional roofing applications, these nails offer reliable performance and are designed for use with coil roofing nailers.