Post caps connect tops of posts to members for a secure connection and are ideal for new or retrofit applications where structural support is needed. Post caps are available in a variety of one-piece caps for new construction and two-piece options for retrofit of existing connections. The AC series is designed to provide a positive connection between a beam and a post; these connectors are always installed in pairs. Features: Eliminates nailing into end grains Stronger than angled nailing or screw fastening Length: 6-1/2-in For use with nominal 4x lumber Made from 18-gauge steel ZMAX galvanization offers extra corrosion resistance for exterior and treated-wood applications Install with 0.162 in. x 3-1/2 in. nails or #10 x 1-1/2 in. Strong-Drive SD screws Simpson Strong-Tie here.