Grip-Rite 20HGC5 4 in. x 6-Gauge 20-penny Exterior Galvanized Steel Smooth Shank Nails are suited for general construction applications including framing and structural assembly with treated lumber. Perfect for woodworking projects, the exterior galvanized finish is resistant to corrosion and rust. Available in many sizes, you're sure to find the right fastener for your projects with Grip-Rite!