3M Keyboard Tray with Adjustable Keyboard and Mouse Platforms, Turn Knob to Adjust Height and Tilt, Swivels and Stores Under Desk, Gel Wrist Rest and Precise Mouse Pad, 17.75" Track, Black (AKT80LE) Simply turn knob to adjust height +1.25"/-4.5" from mounting surface and tilt +15/-15 to get to comfortable working position Highly adjustable and sturdy keyboard and mouse platforms help get keyboard and mouse exactly where you want them for comfort Includes easy to clean leatherette covered gel wrist rest with and Precise Mouse Pad with battery saving design that positions right or left Platform swivels left and right 360 and stows completely under the desk when not is use Lifetime warranty on keyboard arm, five years on keyboard platform, and one year on gel wrist rests Required space under surface needed to mount: 24" W x 18" D