DIY Customized Design: Save desk space by transforming your very own keyboard tray (at least 10.5' in width, 0.6' in thickness, and up to 11 lbs in weight) into an under desk sliding tray with this durable set of clamp-on rails Smooth Slider Tracks: Easily slide your tray in and out from your desk and enjoy ergonomic typing angles that relieve stress on your wrists and shoulders. The tracks are made of solid steel for a stable setup that lasts