The RAM-B-238U consists of a 1" diameter rubber ball connected at right angles to a 2.43" x 1.31" diamond base. The base has two holes 1.912" from center to center, matches the industry standard AMPS hole pattern and will connect to a large variety of RAM Mount and third party cradles.
Powder Coated Marine Grade Aluminum
1" Rubber Ball "B" Size
The "U" in the part number reflects product packaged in poly bag.