Ergo-Comfort Sit/Stand Articulating Keyboard/Mouse Arm Black Granite FleckDetails A keyboard tray that makes it possible to use your keyboard and mouse while seated or standing. The low profile mechanism provides clearance for your knees. Simply lift and release the tray to adjust for 10 1 2" height range. Unit has a 30 tilt range: 15 positive and 15 negative reverse angle and full 360 rotation on a smooth operating 21" track with precision glides. The 28"W x 11 3 4"D keyboard platform includes a Black Therasoft wrist rest