ERGONOMIC: This adjustable keyboard tray lets you fine tune the height so you can achieve your most comfortable typing position. COMPACT DESIGN: This keyboard shelf has a narrower width and depth to accommodate desks with limited space underneath at 20" wide, 24.5" wide including clamps. Three height settings: 2.69", 3.44", and 4.19" H INCREASES USABLE WORK AREA: The under desk keyboard tray reduces clutter on top of your desk. In addition, the retractable keyboard tray slides out of the way when it is not needed.