The RAM adapter base includes a 1.5" diameter rubber ball and inserts directly to the back of Lowrance Elite 5, Mark 5 and Hook 5 Fishfinders. The adapter serves as a quick release mechanism, allowing you to remove or transfer your Fishfinder in seconds.
Material: Powder Coated Marine Grade Aluminum
Ball Size: 1.5" Rubber Ball Size
Note: The "U" in the part number reflects product packaged in poly bag. RAM recommends this adapter base for "Rugged Use" mounting applications, including heavy weight Lowrance Elite and Mark Fishfinders.