Mounts on any Pontoon with a 1 1/4 inch rail. Great for pontoon boats to hold a drink. It’s strong to. Made with highly polished 3003 diamond plate so it won't rust, could last you forever. This cup holder will hold a standard can or bottle. To mount this just remove cup, slide over railing, reinstall the plastic cup. Best part is, it can still slide on the rail but can't fall off. So you can put it anywhere on the boat. If you go swimming you can turn it so you can hold your drink outside the boat too.
IF YOUR RAIL MEASURES 1 1/16" YOU HAVE A 1" RAIL. IF YOUR RAIL MEASURES 1 1/4" OR MORE YOU HAVE A 1 1/4" RAIL.