The RAM-D-101U-246 consists of a 3.68" diameter round base, STANDARD length double socket arm and 4.75" square plate with the VESA hole pattern. The 4.75" square plate has 4x100mm holes and 4x75mm holes in each corner. 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.