Made of ABS plastic, this boat cup holder features anti-slip rubber grips for a secure hold. The adjustable knob ensures a stable fit on boat rails, making the cup holder rock solid and preventing spills. It can hold various drink containers including water bottles, coffee cups, beer cans, and more. Easy to install with a clamp-on design—no tools, drilling, or permanent modifications required. Mounts to aluminum rails, poles, or bimini top rails without damaging the boat. Compatible with pontoon boats, bass boats, jon boats, jet boats, kayaks, yachts, and other watercraft. The adjustable clamp allows rotation and can be mounted on horizontal, vertical, or slanted poles at different angles. Anti-slip rubber lining keeps the holder securely in place and helps prevent drinks from spilling or falling. Designed to be durable, practical, and versatile, this cup holder also provides space to store small items such as sunscreen, pliers, lures, wipes, and other accessories. Color: Black Material: ABS Package Contents: 2 x Cup Holders Note: Light reflection and display settings may cause slight color variations. Measurement may vary by +/- 1-3 cm.