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 Height Adjustable for Ergonomic Typing: Easily slide your tray in and out from your desk and enjoy ergonomic typing angles to relieve stress. The mounting brackets are height adjustable for customized placement (2.4' of total adjustment with 5 set points)