DIY Custom Design - Save space on your desk by turning your own keyboard tray into a sliding under-desk tray with this desk extension tray stand. Package includes 2 brackets, 2 C-clamps with padding, and mounting hardware. Ergonomic Design - This desk extension tray stand allows you to easily slide your tray in and out of your desk and enjoy ergonomic typing angles that relieve your wrists and shoulders. The rails are made of solid steel for a stable and durable installation! Sturdy C-clamps - Use this desk extension tray stand without damaging your desk (desk thickness is recommended 1-8cm). The C-clamps hold everything firmly in place and adjust with a simple hand tightening. Before purchasing, be sure to measure the size of the desk (if the center of gravity is too far from the desk, the clamp will be subject to excessive pressure and easily deformed). Clamp Design & Sponge Protective Pads - The desk extension tray support fits desks with a thickness of 1-8cm. The non-slip handle prevents unwanted movement and damage to the desk. The upper and lower sponge pads between the clamp and your workstation can prevent damage to your workstation, fully protecting your desk. Easy Installation - It comes with all the necessary hardware, and it is easy to mount your keyboard tray on the desk extension tray support up to 25kg.