This product will let you attach your fishfinder (Garmin, Lowrance, Humminbird, Raymarine) to your boat, kayak, jetski, etc. It includes a 2.5" diameter round base, double socket arm, and a 6.25" x 2" (15.87cm x 5.08cm) rectangle base. 

The rectangle base has many different combinations of pre-drilled holes, to match a variety of electronic devices, and the 2.5" diamater base has the standard AMPS hole pattern. The double socket arm uses the RAM 1.5" ball system, with adjustment points at both ends.

• Material: Powder Coated Marine Grade Aluminium
• Ball Size: 1.5" Rubber Ball Size
• Made in the USA and comes with a lifetime warranty.

Note: The "U" in the part number reflects product packaged in poly bag. The 6.25" x 2" (15.87cm x 5.08cm) 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.