Check the listing for details. RAM Mount 6.25" x 2" Universal Marine Electronics Base Plate with 1" Ball. Condition: New, Made in United States. Listed at 21.49 USD. Features: ---Base plate 6.25" x 2" with a 1" rubber ball ---Multiple holes, including AMPS hole pattern, pre-drilled into the plate for connecting a variety of devices* ---Fits most RAM 1" ball compatible socket arms ---Constructed of powder coated marine grade aluminum ---Genuine RAM Mount: Part # RAM-B-111BU ---Manufacturer's lifetime warranty ---Made in the USA Compatible Devices: ---Garmin Fishfinders and GPS Chartplotters ---Humminbird Fishfinders and GPS Chartplotters ---Lowrance Fishfinders and GPS Chartplotters ---Raymarine Fishfinders and GPS Chartplotters ---GPS, CB Radios, Ham Radios, Gimbal Brackets and more. * Some applications may need additional holes to be drilled for proper fit with your electronic device.