Constructed from 14-gauge high-strength steel and finished with a black powder coating, it resists cracking, peeling, and rusting, ensuring long-lasting performance.Position the steel nails before the concrete sets and allow them to sun-dry for a permanent hold. Insert 3.5 x 3.5-inch wooden posts and fasten screws through 10 pre-drilled openings. (Screws not included)The U-shaped design keeps wood elevated from damp concrete, reducing the risk of moisture damage and enhancing the stability and lifespan of the fence posts.Ideal for 3.5 x 3.5-inch wooden posts, these 4x4 concrete anchors are perfect for porch railings, post holders, mailboxes, support brackets, and more.Each set includes 4 post holder brackets. Wood posts and mounting screws are not included.