RAM Part RAM-102U-2461 : The Powder Coated Marine Grade standard diamond adapter with the standard 75mm x 75mm VESA mounting pattern common to many flat panel TVs along with a RAM 1.5" ball.  The mount consists of consists of a double socket arm and 3.625" square plate with VESA hole pattern. The VESA plate contains 75x75MM hole patterns. The rubber ball is positioned 0.88" from the center of one edge. Rubber ball, socket technology dampens shock and vibration, as well as allows for almost infinite adjustment, perfect viewing angles.  This mount comes equipped with a locking knob and key to minimize theft potential.