RAM Mount 3.625" Square Base VESA Plate 75 x 75mm Hole Pattern w/Surface Mount [RAM-D-101U-2461]The RAM D 101U 2461 consists of a double socket arm, 2. 5" diameter round base with the universal AMPS hole pattern and 3. 625" square plate with the VESA hole pattern. The VESA plate contains a 75mm X 75mm hole pattern. 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