This quick release waterski rack is made with solid aluminum and holds 2 x water skis. WaterSki Rack Specs: The distance between the fingers are 16" Clamp comes along with 1 3/4",1 7/8", 2", 2 1/4",2 3/8" rubber for additional tubing sizes. DOES NOT FIT 2.5" on Monster towers 4 bolt ball clamp stronger than those with 2 bolts. Built with solid 6061 aluminum and polished This aluminum waterski rack is easy to install and will mount to horizontal or vertical or slant tubing at any angles (vertical recommended) Quick release knob allows you to remove the rack (clamp stays on tower) Add Optional Swivel Mount to the Quick Release Waterski Rack so that you can rotate your boards into the boat with ease! Use the standard swivel mount for mounting on straight vertical tower legs. If you are mounting on tower tubing that is not vertical then you may want to opt for the extended swivel mount.