Galvanized for durability and corrosion resistance, Designed to support vertical loads (not recommended for fencing applications), Post holder does not provide adequate lateral resistance to wind or other horizontal loads, Designed to secure 4x4 wooden post to concrete, Secure post using four 16d (3 1/2) hot-dipped galvanized nails (one in each of the four small holes), Heavy-gauge steel plate and rebar construction