Easy to Install No Tools Required for Install Made in the USA Made with Marine Grade HDPE for years of exterior use. Premier Pontoon Rail Cup and Wine Glass Holder - for 2" Tall Rails only. The Premier Brand Pontoon Rail Cup Holder is specifically designed to fit the new style of rail system that is 2" tall in profile height. Provides a safe location for your beverages will out on the water. Add this easy to install Cup and Wine Glass Holder in any location that you need additional convenience for your boating guests. Fit rails with or without screening panels.