The RAM-B-202-339U consists of a 1-inch diameter rubber ball connected to a flat 2.5-inch diameter base and a triple magnetic base adapter. The 2.5-inch diameter base contains pre-drilled holes, including the universal AMPS hole pattern. The magnetic base adapter features three rare earth magnets that hold firmly to ferrous metals. Simply place this product near the mounting surface and feel it almost jump out of your hand. The composite adapter designed to conceal the magnets is made of durable material to prevent scratching the mounting surface. Ideally suited for many applications, you're sure to find numerous ways to use your new magnetic mount at work, home, on the go, or at play.