Designer Suites Monitor Riser features three height adjustments to prevent neck and shoulder strain. Use riser to raise monitor to comfortable viewing height while maximizing work space. Riser supports monitors up to 21" and 40 lb. and offers heightadjustments 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. Nonskid rubber feet protect worksurface from scratches or scuffs.