The Swivel Clamp Adapter is designed to provide a transition between your universal clamp and swivel board rack. Roswell's Swivel Clamp Adapter provides accurate degrees of rotation that allow you to level your swivel board rack no matter what tower you have installed on your boat. Brushed anodized finish. Compatible with Roswell clamp and swivels. Allows you to level your swivel board rack Universal design works with most towers