①. Boat cup holder made of ABS plastic. The cup holder clip with anti-rubbers has strong grip, mounts to the boat rail. Adjustable knob makes the cup holder stable on the rail. You can put drinks in these cup holders and reduce the worry about spilling. ②. The cup holders are easy to install, just clamp and use without any tools and assemblies. No drilling needed and no damage to boat. Mounts on boat aluminum rail, pole or bimini top rail. ③. Boat drink holder is simple, unique, durable and practical. Designed cup holder can hold different size bottles. Adjustable clamp allows rotation, suitable for horizontal poles, any slanted poles, not just vertical. So it can be installed at different angles. Anti-rubbers keep the inside fixed, help prevent drinks from spilling and falling down. ④. Boat rail cup holder can hold water bottles, coffee cups, beer, cans, glass and so on. Mounts to rails on boat, can move cup holders to any rail. Suitable for Yacht, Pontoon boat, bass boat, Jon boat, Kayak and so on. ⑤. Universal Drinks Holders have space inside to hold miscellaneous items, such as suntan lotion, fish pliers, drinks, hand wipes, lures, some little rubbish and so on. ⑥. Color: Black ⑦. Material: ABS ⑧. Package Contents: 2 x cup holder ⑨. Only the above package content, other products are not included. ⑩. Note: Light reflection and different displays may cause the color of the item to have a little difference from the real thing. The measurement allowed error is +/- 1-3cm.