"Keep your favorite beverage at hand with the Master Magnetics magnetic cup caddy when working in the garage, workshop or outdoors. Powerful magnet attaches to any ferrous metal surface including toolbox, cabinet or even your stationary vehicle. Holds an insulated mug, hot or cold container, aluminum can or fountain cup. Also useful for keeping cans, spray paint, lubricants, small tools and more within easy reach. Diameter in. 3 1/2, Dimensions L x W in. 4 5/8 x 3 1/2, Material Plastic, Product Style Holding magnet. Holds containers up to 3.25in. diameter at base Rubber backing prevents surface scratches"