Wakeboard Tower Kneeboard Wake Combo Rack Oval Use the adjust rubber, the clamp can fit 2" or 2.25" or 2.5inch wakeboard towers. This Rack is made of 6061 aluminum, more durable and effortless to take it anywhere. Surface treament is Anodize finish, resistant to corrosion of sea water. This item is brand new and in original manufacture packaging. Bungee cord safety strap to secure boards.