Krypt Towers polished wakeboard tower clamps. This clamp in size large will fit tubing sizes: 1 1/2", 1 3/4", 1 7/8", 2", 2 1/4", 2 3/8", or 2 1/2". These tower clamps are made of solid polished 6061 aluminum. Our polished aluminum wakeboard tower bimini clamps are great for replacing old clamps, fitting existing tower accessories on a new wakeboard tower tubing size, or completing a Do It Yourself tower accessory project.