Krypt Towers polished wakeboard tower clamps for Krypt Stealth Wire speaker cans. This clamp will fit tubing sizes: 1 1/4", 1 1/2", 1 5/8", 1 3/4", 1 7/8", or 2", 2 1/4", 2 3/8", 2 1/2", 2 3/4", 2 7/8", 3". These tower clamps are made of solid polished 6061 aluminum, and each clamp comes with 2 x stainless Allen head screw and lock washer. The base of the clamp has 3 holes; center hole is a pass through for speaker wiring, and the 2 adjacent holes are non threaded and a pass through for the provided M6 x 30 stainless screws.