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. Install with 16D common nails or #10 x 1-1/2 in. Strong-drive sd screws.