The RAM-111U-B consists of a 2.5quot; diameter round base that contains the universal AMPs hole pattern, SHORT LENGTH double socket arm and 6.25quot; x 2quot; rectangle base. The rectangle base contains different combinations of pre-drilled holes which will match up to many electronic devices and mounts, including Marine GPS, CB Radios, Ham Radios, Gimbal Brackets and more. Dimensions: Overall Length: 5.225quot; Material: Powder Coated Marine Grade Aluminium Ball Size: C Size 1.5quot; Rubber Ball Weight Capacity: Up to 4 lbs Weight: 1.08 lbs. Note: The quot;Uquot; in the part number reflects product packaged in poly bag. The 6.25quot; x 2quot; rectangle base is a universal mounting bracket with a selection of mounting hole locations. In certain applications additional holes may need to be drilled for proper fit with your electronic device. Will suit the following units: Garmin GPSMAP 722xs Garmin GPSMAP 742xs Garmin Striker Plus 5cv Garmin Striker Plus 7cv Garmin Striker Plus 7sv Lowrance HDS Carbon 7 Lowrance HDS LIVE 7 Garmin Fishfinders and GPS Chartplotters Humminbird Fishfinders and GPS Chartplotters Lowrance Fishfinders and GPS Chartplotters Raymarine Fishfinders and GPS Chartplotters