Pressure Treated Lumber Deck & Trim Nails 2-1/2 Inch 8 Penny, 11 Gauge, 9/32 Head, Spiral Shank Pound. Approximately 111 nails per pound. MADE IN USA. These nails are made from stiffer stock so the shanks can be smaller in diameter to help reduce wood spliting without bending. Spiral shanks provide exceptional holding power. Producers of treated lumber and many building codes specify hot ipped galvanized because they have a life expectancy comparable to that of treated lumber. Meets ASTM-A153.