These handy cup holders attach securely to boat railings, keeping drinks stable on the water. Made of durable ABS plastic, each cup holder features a wide opening that accommodates anything from water bottles to large tumblers. Non-slip gripping pads on the bottom ensure it stays put even under rough conditions. An adjustable strap fits rails up to 1.5 inches thick, allowing it to be used on a variety of small watercraft. Lightweight and compact, it packs away easily for storage. Protect your drinks and keep your boat organized with this must-have accessory.