The High Strength Plastic Universal Plate has a 1.0" diameter Round Male Button on an Octagon Neck connected at right angles to a 1 1/4" x 2 1/2" Diamond Plate. The plate has two holes 1.912" from center to center, positioned at either tip of the diamond plate. NOTE: This base plate will attach to any of the RAM plastic HOL holders and the industry standard AMPS hole pattern.