Krypt Towers- Double Wakesurf/Surfboard Tower Rack, 6061 Aircraft Grade Polished Aluminum,Full Size, Will Fit All Round Tubing Wakeboard Towers,Clamp Sizes-1 3/4", 1 7/8", 2", 2 1/4", 2 3/8", 2 1/2" Clamp Sizes: 1 3/4", 1 7/8", 2", 2 1/4", 2 3/8", 2 1/2" Finger opening is 2.25" and will fit Wakesurf Boards up to 2.25" in thickness Easy installation and attaches to round tubing towers. Secures 2 Surfboards/Wakesurf Boards, Bungie strap to hold boards secure Polished 6061 Aluminum, Rubber bumber finger inserts for board protection