The RAM-D-101-MIU consists of (2qty) 3.68" diameter round bases and STANDARD length double socket arm with jam nut. The 3.68" diameter round bases have 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.