We have designed a computer keyboard/mouse tray that travels from side to side on a trolley and rail system. The rail is secured to the bottom of the platform surface that is part of the legset/stand. The keyboard shelf and its welded support brackets are secured to the trolley which rides smoothly on the rail via (4) bearing wheels. The keyboard shelf is fabricated with Melamine coated MDF, and edged in 1/8" thick "T" moulding, and is 27" wide by 8" deep.