This rack is made with 6061 Aluminum and polished to shine. The quick-release function allows the user to quickly disconnect the backplate from the clamp for storage, entering boat slips/lifts, and for tieing up to other boats. It holds 2 x wakeboards and has a 1.3" board slot. Fits tubing sizes 1 3/4",1 7/8", 2",2 1/4", 2 1/2",2 3/8" and 2 1/2" tubing sizes. Built to last; this is a solid, high-quality rack. Easy to install and will mount to horizontal or vertical tubing and adjust to angles in between.