Make sturdy, good-looking projects that will last with the RTC Rigid Tie. This series secures two wood members to a vertical post forming a 90° corner. Rigid Tie connector products are great utility connectors used to connect wood members together in a variety of ways. RTC 14-Gauge ZMAX® Galvanized Rigid Tie® Corner for 4x, 4×4 Post (Pack of 360).