Krypt Towers polished wakeboard tower clamps. This clamp in size small will fit tubing sizes: 1 1/2", 1 3/4", 1 7/8", or 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.