Mounts on any 1 inch Backseat golf cart rail or square tubing. Great item for your backseat riders to hold a drink. It’s strong too. Made with highly polished 3003 diamond plate so it won't rust, could last you forever. To mount this just remove cup, slide over railing, reinstall the plastic cups, that's it cup will fit tight on rail so it won't bounce out. Best part is, you can turn it so you can hold your drink outside the cart too. Will fit a can or bottle with a thin koozie.