Boat Rail Mount Base：Obcursco boat cup holder is equipped with a boat rail mount base and fits boat railings with round tube or square tube of diameter 20-25mm, making it easy to install. The lock function design ensures a stable installation.Great Durability: Our boat cup holders for drinks is made from marine-grade ASA, which is sunlight resistant, salt water resistant, non-fading even when exposed to harsh marine environments.Multi-Functional Cup Holder: The cup holder for boat not only can hold most size cans, bottles, cups, and even coffee mugs, but also can store some fishing gear.Anti-Spill Design: The boat drink holder features an anti-spill design that keeps your drinks from spilling or tipping over, even when you're boating on rough waters.Convenient and Practical Caddy: Our boat cup holders for drinks rail mount are suitable for most boat, such as pontoon, bass boat, fishing boat, jon boat and sailing boat, perfect for installing on the bimini top, marine grab, handrail, and grab bar. Product Description Boat Cup Holder with Slide Rail Base The Obcursco boat cup holder comes fully equipped with a sturdy boat rail mount base, ensuring a secure and stable fit on boat railings with a diameter ranging from 20-25mm, whether they're round or square-shaped. Track Page Views WithAuctiva's Counter