The RAM-B-217U consists of two 1" diameter rubber balls connected to a post and 2.5" diameter round base. The round base has pre-drilled holes, including the universal AMPs hole pattern and 3-hole 120 degree pattern. The 1" balls measure center to center 2.5" apart.
Material: Powder Coated Marine Grade Aluminum
Ball Size: 1" Rubber "B" Ball Size
Note: The "U" in the part number reflects product packaged in poly bag.