40d 5-1/8" x .148 Heavy-Duty 21 degree Jumbo Framing Nails These 5-1/8" strip nails are 21 degree angle, collated (held together) with a plastic strip. Made of .148" (9 gauge) SMOOTH shank non galvanized brite steel, they are commonly used for heavy-duty wood framing applications. 5 1/8 x 148 Not recommended for ACQ Treated Lumber. Make sure your tool allows for the 5-1/8" length. Each box contains approximately 1,250 nails.Applications Include:Framing, truss building, subflooring, side wall and roof sheathing, pallets and crate assembly.