RAM MOUNTS' RAM-246-2461U RAM 1.5 in ball mount with 3.625 in square base VESA (4 x 75 mm) and 4.75 in square base VESA (4 x 75 mm) (4 x 100 mm)brbr The RAM-246-2461U consists of a double socket arm, 3.625 in square plate and 4.75 in square plate. The 3.625 in square plate contains a 75 mm x 75 mm VESA hole pattern. The 4.75 in square plate contains a 4 x 100 mm holes and 4 x 75 mm hole pattern. Designed into the mount is a 1.5 in diameter patented rubber ball and socket system with adjustment points at both socket ends of the arm.