Clamp-On Rail Mounted Cup Holder - Large for Up to 2" Rail - WhiteCamco&';s Clamp-On Rail Mounted Cup Holder provides a secure location to keep your beverage. It is a great addition to any boat with 1-1/2-inch to 2-inch rails. The secure clamp assembly keeps the cup holder in place with the help of tension adjustment screws. Swivel mount allows you to install on any angle rail keeping your cup holder level and in place. The cup holder is constructed of a durable, UV-resistant polymer and fits most standard sized drinks, cups, cans, bottles and tumblers.Features: The Perfect Boating or RV Accessory: Provides a secure location to keep your beverage; Cup holder mounts to 1-1/2-inch to 2-inch boat rails Compatibility: Fits most standard cups, cans, bottles and tumblers Swivels to Any Angle: Swivel mount allows you to install on any angle rail keeping your cup holder level and in place Durable Construction: Constructed of a durable, UV-resistant polymer Color: White