Have this PRO-FIT 3/4 in. Electro-Galvanized Roofing Nail delivered onsite. Coating: Electro galvanized for exterior use. Code: Aligns to ASTM F1667, as applicable. Applications: Designed to attach asphalt shingles, insulation board, and felt to wood substrates. These can also be used with vinyl siding. Head Style: Flat head offers a large striking surface for easy drive connection and holding power. Shank Style: Heavy and smooth shank offers great holding power and are fast and easy to drive. Point Type: Diamond point starts fast and drives easily. Length: Nails are 3/4 in.