The RAM-D-101U-MI1-2461 consists of a 3.68" diameter round base, STANDARD length double socket arm with jam nut and 3.625" square plate with the VESA hole pattern. The VESA plate contains a 75mm X 75mm hole pattern. The 3.68" diameter round base has pre-drilled holes, including two holes at 180 degrees and three holes at 120 degrees. Designed into the mount is a 2.25" diameter patented rubber ball and socket system with adjustment points at both socket ends of the arm. Rubber ball and socket technology allows for almost infinite adjustment and perfect viewing angles.