This Grip-Rite No. 12 1 in. Cap Electro-Galvanized Plastic/Steel Nail Plastic Head is perfect for a variety of applications. The steel nail is electro-galvanized for added durability, while the plastic head provides a clean, finished look. The Grip-Rite No. 12 1 in. Cap Electro-Galvanized Plastic/Steel Nail Plastic Head is ideal for use with wood or composite materials. Grip-Rite plastic cap nails provide the right solution when you need to secure house-wrap, rigid insulation and felt. Used for attaching building paper, foam sheathing, roofing materials, and poly film vapor to building or homes.