【Sturdy Stainless Steel】The foldable cup holder is made of high quality stainless steel to withstand harsh marine environments. Waterproof and easy to clean. Can be used for a long time. 【Adjustable Clamp Arm】The universal foldable cup holder fits a variety of cans from 55mm to 75mm in diameter, many types of coffee cups, water bottles, coffee cup holders, etc. 【Wide Application】It is often used in cars, RVs, boats, yachts, and can also be installed in wheelchairs, cars, etc. 【Non-slip and Stable】The cup holder is designed with foam padding to reduce noise and slippage, and the silicone mold on the fixed arm protects the cup from damage and keeps it stable. Note: The data are all measured manually. Due to the difference in light and display, please allow an error of 1-3 cm. Please refer to the actual object received.