3M Adjustable Keyboard Trays help place your keyboard and mouse at proper level to increase comfort and productivity. AKT180LE has an sit/stand easy adjust arm- just tilt platform, adjust and release to lock in place. Adjusts height to 10" above mounting surface and 4" below mounting surface allowing you to alternate between sitting and standing positions. Tilt is adjusted by dialing tilt knob to desired angle. Sturdy platform has proprietary lateral adjustments for getting the keyboard exactly where you want it. Articulating mousing platform adjusts in all directions, tilts forward and back, and can be mounted on the right or left side of the keyboard platform.