Simpson Preservative-Treated Wood Decking Nails are ideal for decks and docks. The checker pattern heads blend in with wood grain and reduce sunlight glare. Annular ring shank increases pull-out resistance to prevent nail heads from popping up over time. Larger shank diameter easily penetrates both green and seasoned preservative-treated lumber. Simpson Preservative-Treated Wood Decking Nails are ideal for decks and docks. The checker pattern heads blend in with wood grain and reduce sunlight glare. Annular ring shank increases pull-out resistance to prevent nail heads from popping up over time. Larger shank diameter easily penetrates both green and seasoned preservative-treated lumber.