Desk riser allows you to go from sitting to standing with ease. Stop easily at any position from 5-1/8" x 19-1/4" when adjusting the height. Desk riser operates with a gas-spring monitor lift for smooth, easy ascension. The 23-1/4" x 12-3/8" keyboard tray tilts between negative 5 & positive 15 degrees & offers a 20mm height-adjustment range. The X-type frame is made of sturdy steel. Worksurface & tray are made of medium-density fiberboard with PVC finish. Desktop weight capacity is 33 lb. Keyboard tray can hold up to 4.4 lb.