Monitor arm allows you to free up space on your desk and set your LCD monitor at the best ergonomic position. Mechanically adjustable arm moves up, down, forward, and back. Height adjusts up and down through a 13" range. Monitor can rotate to portrait or landscape, swivel 180 degrees, and tilt forward and back 80 degrees for optimal ergonomic positioning. Clamp/grommet mount hardware is designed for desks up to 1-7/8" thick. Arm fits both 75 x 75mm and 100 x 100mm VESA-D monitor bolt hole patterns. Monitor arm is designed for LCD monitors up to 20 lb.