Krypt Towers polished wakeboard tower clamps. This clamp in size large will fit tubing sizes: 2 1/4", 2 3/8", or 2 1/2". These tower clamps are made of solid polished 6061 aluminum, and each clamp comes with a stainless Allen head screw and lock washer. Our polished aluminum wakeboard tower 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 speaker project.