RAM 2" x 3" Rectangle Base with 1.5" BallThe RAM-202U-23 contains a 1.5" diameter rubber ball connected at right angles to a 2" x 3" rectangular base. This mount has pre-drilled holes at each corner of the base plate. Material: Powder Coated Marine Grade AluminumBall Size: 1.5" Rubber Ball Size Note: The "U" in the part number reflects product packaged in poly bag. Mounting hardware not included with purchase.