RAM Base & Ball w/Garmin Mounting HardwareRAM-202-G2 universal base consists of a 1.5 inch diameter rubber ball, connected at right angles to a 2.5 inch diameter round base. The base has pre-drilled holes, including the universal AMPS hole pattern. The RAM-202-G2 comes with a custom hardware pack for assembly for your Garmin Fishfinder.The "U" in the part number reflects product packaged in poly bag. For additional specifications, see components and drawings tabs. Ball Size: 1.5 Inch Rubber Ball Color: Black Powder Coat Material: Powder Coated Marine Grade Aluminum