The RAM-B-238U Powder Coated Marine Grade Aluminum Universal Plate has a 1.0 inch diameter Rubber Ball connected at right angles to a 1 1/4 x 2 1/2 inch Diamond Plate. The plate has two pre-drilled holes positioned at either tip of the diamond plate. The hole pattern found on the Diamond Plate will connect to a large variety of RAM Mount and third party cradles and mounts, including those with the industry standard AMPS hole pattern.

For a layout of the hole spacing and 1.0 inch rubber ball location, take a closer look with the RAM-B-238 Design Drawings(pdf file).