R-159-A. These extra-long ?Asphalt Shingle Nails? are designed for the application of structural roof deck to wood trusses or rafters. Also great for application of shingles over rigid foam insulation into roof decking and for the installation of ?ridge vents?. Large heads prevent pull-through. Ring shanks provide exceptional holding power. STORMGUARD Double Hot-Dip Galvanized.