Tengchang CNC Wakeboard Tower Rack Plus Wakeboard/Kneeboard Combo Rack CFR-KWA-1 This Rack is made of 6061 aluminum. Surface treatment is Anodize finish. The wakeboard rack is made to fit 2" or 2.25" or 2.5inch wakeboard towers. The oval shaped plate holds the forks for two wakeboards Bungee cord safety strap to secure boards