The RAM-233U rail kit consists of a U shaped rail adapter that connects to a round 2.5" base. All hardware to connect the rail adapter to the plate is included, along with a rubber strip to allow a tight grip on the rail.
Specs & Features
Material: Powder Coated Marine Grade Aluminum
Ball Size: C Size 1.5" Rubber Ball
Note: The "U" in the part number reflects product packaged in poly bag.