- Powerful Magnetic Hold: Our cup holder features a robust and straightforward design that incorporates six strong magnets encased in durable black rubber. This ensures a secure grip on any metal surface, providing a reliable storage solution for your beverages. - Simple Installation: Designed for ease of use, this magnetic cup holder can be quickly installed on various metal surfaces including treadmills, tractors, mowers, trucks, cars, boats, and storage racks. Once attached, it stays firmly in place, eliminating worries about spills or movement while you're on the go. - Portable and Removable: Always ready for use, this boat cup holder can be easily relocated without any tools, making it ideal for travel, work, and both indoor and outdoor activities. Simply detach and reattach wherever you need it. - Ample Capacity: The cup holder boasts an inner diameter of 3.2 inches and a height of 3.5 inches, making it large enough to accommodate most drink containers. It's designed to hold 10-40 ounce tumblers, travel mugs, water bottles, and cans with a diameter of up to 3.2 inches. Use Scenarios: - Securely attach it to your treadmill during workouts for easy access to hydration. - Keep drinks within reach on your tractor while working outdoors. - Perfect for use in trucks and cars during long commutes or road trips. This magnetic cup holder combines practicality with strong performance, ensuring your drinks are always close at hand, no matter where you are.