The RAM-102-2461 mount consists of a LONG arm with a 3.63" square 75mm VESA plate at either end. The size of the ball and socket system of the mount is 1.5" diameter. The VESA 3.63" plate has the same hole configuration as found on the back of a LCD flat screen. This mount is great for mounting a LCD screen in any location your can think of, from your vehicle to your boat.