The popular SI Surf Rack has a 2.5" top slot for use with wake surfboards or standard surfboards. A thin recess at the rear of the slot stabilizes the wake surfboard while underway. Features a curved backing plate, polished aluminum finish, and window-net style strap with stainless steel clip. This rack is a seamless addition to the Roswell 51 Tower with no clamps required. It can also be added to other towers by using the Roswell Universal Clamp (item #693433 sold separately).