A nylon collar bushing protects the tower and like almost all of our products makes the wakeboard rack universal. Each rack is shipped to fit 1 7/8"- 2 1/8" towers . Wakeboard Rack Features: Made with strong polished aluminum and fasteners Long lasting brushed, bright dipped anodized finish Thick rubber bumper protects boat and boards Adjustable fork to accommodate any size board Includes quick release mechanism for easy removal 。