Mouse tray slides to left or right, depending on user preference. Wrist rest holder is adjustable. Sturdy steel construction. Order this item with keyboard arms or pivots that are not bundled with a keyboard tray. This is NOT a stand-alone product.Color: GrayHeight: 2.5Width: 17.5"Depth: 12"Compatibility: 400, 300, 200 and 100 Series Keyboard/Laptop Arms and Pivots"