Check the listing for details. RAM-B-202-339U RAM Magnetic Ball Base.... Color: Black, Condition: New. Listed at 37.94 USD. RAM Magnetic Ball Base... RAM-B-202-339U Genuine RAM Products! The RAM-B-202-339U consists of a 1 INCHES diameter rubber ball connected to a flat 2.5 INCHES diameter base and triple magnetic base adapter. The 2.5 INCHES diameter base contains pre-drilled holes, including the universal AMPS hole pattern. The magnetic base adapter contains 3 rare earth magnets that hold firm to ferrous metals. Simply put 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 composite to prevent scratching the mounting surface. Ideally suited for many applications, you're sure to find many ways to use your new magnetic mount at work, home, on the go, or at play.hardware included Assembly Hardwareplate size 2.5 INCHES Diameterball size B Size (1 INCHES )weight capacity .5 lbmaterials Marine-grade aluminumRubberpackaging type Poly BagWeight 0.3 lb hardware included Assembly Hardware plate size 2.5 INCHES Diameter ball size B Size (1 INCHES ) weight capacity .5 lb materials Marine-grade aluminumRubber packaging type Poly Bag Weight 0.3 lb