Add a second extension to your LX Sit-Stand Keyboard Arm and increase its reach by 11.7" (30cm). Also works with the Interactive Arm, LD if you want to give it another point of rotation while extending the distance your TV can span.- Increases the reach of an LX Sit-Stand Keyboard Arm or Interactive Arm LD.- Adds another pivot-point for more adjustment flexibility.- Cable management feature routes cables under the arm, out of the way.