The Fellowes Designer Suites Monitor Riser features three height adjustments to prevent neck and shoulder strain! Unit raises monitor to comfortable viewing height while maximizing workspace. Supports monitors up to 21″ or 40 lbs. and offers height adjustments up to 1-5/8” (between 4-3/8” and 6”) for optimal viewing angle. Storage tray organizes essentials such as pens and paper clips. Includes non-skid rubber feet to protect work surface from scratches or scuffs.