Work either sitting or standing with Sit/Stand Keyboard Manager. Simply tilt keyboard tray forward, raise up to 8-1/2" or lower to desired height, and release to lock into place. Use lever to tilt tray within a 30-degree range for optimal keyboard position and rotate keyboard or mouse tray to preferred work position. Fits virtually every keyboard. The durable wood fiber construction provides lasting performance. Curved ergonomic shape fits the natural contours of the body. Includes keyboard and mouse tray with gel wrist rests. Mouse tray mounts to either right or left side of the keyboard tray and can slide under keyboard tray for easy storage when not in use. Includes longer smooth-rolling 21" ball-bearing track for extra stability during use. Adjusts from 5-1/4" below desktop to 8-1/2" above desktop.