Cup Holder Series - Adjustable fixed arm design to accommodate different size drinks (cups, cans, bottles, glasses, etc.). 3 1/8" (80mm) diameter (includes 2 foldable cup holders) COMPACT FOLDABLE DESIGN - The foldable design only protrudes 1 inch when closed, saving space when not in use. Super convenient and corrosion-resistant on-board beverage storage VERSATILE: The cup holder mounts to any flat vertical surface; you can mount it on the wall next to your sofa, next to your bed, or anywhere in your home, car, or gym to provide more convenience for your daily life, commuting, or traveling. What a convenience. CORROSION RESISTANT IN MARINE ENVIRONMENTS - Adjustable cup holders, also known as boat cup holders, are made of UV-resistant ABS plastic and stainless steel to prevent corrosion in marine, boat, recreational boating and cruising environments. EASY INSTALLATION: Car, van and boat cup holders come with mounting hardware and are easy to install on any flat surface. Secure your