Monitor arm allows you to free up space on your desk and set your LCD monitor in the best ergonomic position. Mechanically adjustable arm moves up, down, forward, and back. Height adjusts up and down through 8" at six fixed positions. Monitor can rotate to portrait or landscape, swivel 180 degrees, and tilt forward and back 180 degrees for optimal ergonomic positioning. Clamp mount system is designed for desks up to 1-7/8" thick. Design fits both 75 x 75mm and 100 x 100mm VESA-D monitor bolt hole patterns. Monitor arm is designed for LCD monitors up to 18 lb.