About this item Cup Holder Range - Adjustable retaining arms design to hold your different size drinks (cups, cans, bottles, glasses, etc.) max. 3 1/8 inch (80 mm) diameter (includes 2 folding cup holders with mounting hardware) Compact Folding Design - The folding design protrudes only 1 inch when closed, saving space when not in use. It is a super convenient and corrosion-resistant onboard storage for your drinks Versatile - The adjustable cup holder allows for 2-way installation. The cup holder mounts to any flat vertical surface; You can install it on the wall next to the sofa, on the side of your bed or anywhere in your home, car or gym, providing more convenience in your daily life, travel or trip Marine Corrosion Resistant - The adjustable cup holder, also called boat cup holder, is made of UV-resistant ABS plastic and stainless steel hardware to prevent corrosion in marine, boat, ship, cruise environments Easy Installation - The cup holder for cars, vans and boats comes with