Simpson 4 1 2 in. 30d Annular Ring Shank Common Nail Type 316 Stainless 6 Ga 0.203 in. Shank 25 lb. AC Adjustable Post Cap Expanding sleeve anchor for solid Expanding sleeve anchor for solid base materials grips firmly in concrete and brick Its Hot Dip Galvanized finish makes it a strong choice for exposed or corrosive environments A specification backed choice for permanent wood foundations alignment with the ANSI AWC Permanent Wood Foundations Design Specifications gives builders and contractors confidence that these nails meet recognized industry guidance for one of the most demanding residential fastening applications Made in the United States by Simpson manufactured to consistent quality standards from a brand recognized for structural fastener engineering