These nails are made from stiffer stock steel so the shanks can be smaller in diameter to help reduce wood splitting without bending. Spiral shanks provide exceptional holding power. Producers of treated lumber and many building codes specify hot-dip galvanized or stainless steel nails because they have a rust-free life expectancy comparable to that of the treated lumber. Maze STORMGUARD® “P.T.L.”® Nails are double dipped in molten zinc. Shipped in Standard 50-lb. or 25-lb. Bulk Cartons Unless Otherwise Specified. (6) 5-lb. boxes per master. (25) 1-lb. boxes per master.