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. AC ZMAX® Galvanized Adjustable Post Cap for 6x (Pack of 20).