Mount-It! Ergonomic Clamp On Keyboard Tray Maximize your desk top space with Mount-It! MI-7143 ergonomic clamp on keyboard tray. No need to lay upside down to install your keyboard tray nor damage your desk with drilling. Simply clamp on to install. The sliding tray has ample room for your keyboard, mouse, wrist rest and more. All necessary instructions and hardware included. No screw clamp keyboard tray. Clamps to any surface. Extra large platform measures 27" wide. Smooth slide in and slide out. Made with heavy duty material.