HIGH QUALITY DESIGN: The Post Holder Bracket is made of heavy-duty steel and rebar, U-shaped structure is made of thickened steel plate Seamless welding, black powder coating on the surface, Waterproof and Rust-proof; Four threaded steel post are used underground to penetrate deep into the ground, Firmly connecting with the soil-mixed foundation, Making the connection between the wooden columns and the ground more stable and safer. APPLICATIONS:The U-shaped post base fits standard 4 "x4" (Actual 3.5 "x3.5") wood post assemblies, The wooden posts are connected to the brackets by means of two-way interlocking screws, Which gives the post a more stable force and a longer service life. It can be used as a connection between wood posts and wet paved concrete foundations for deck railings, patio posts, fences, gazebos, mailboxes and more. SIZE: Concrete Post Base Holder standard 4"x4" (Actually 3.5"x3.5") wood post; 3.66" x 3.5" x 16" (Above Ground: 8", Below ground: 8") . QUICK INSTALLATION: Concrete Post Anchor Set includes all accessory screws, installation steps: 1. Pour the wet concrete into the pre-designed pit, then insert the footing bolts into the concrete until they are parallel to the concrete; 2. Insert the wooden post after the concrete dries, drill preset holes in the front and back sides with an electric drill and lock the screws into place; 3. Drill the upper and lower through holes in the middle of the wooden post with an electric drill, and then SET CONTAINS: 2 Base Bracket ; 4 Sets of Screw/nut sets (Φ5/16"*L4.5"); 8 Hex screws (Φ1/4"*L1.57"); 16 Screw Washers (Φ1/2"); 1 drill bit (Φ1/4"); 1 Electric drill socket. If you have any questions, please feel free to contact us connect! Fence Post Holder