Add on laptop holder for use with X-Series keyboard stands. Attaches to the top tier of any 'X' style stand having a 30mm diameter. Can accommodate virtually any size laptop. Four stoppers, adjustable in width and depth, will securely anchor any size laptop, without interfering with input/output ports, expansion slots, cd-rw/dvd drivers, AC adapter sockets placed on either side of the laptop. The laptop tray is height and tilt adjustable and swivels 360 degrees to allow for ideal positioning of the laptop. Equipped with pull out mouse tray that can be positioned on either the right side or the left side of the laptop, and is retractable for easy storage and transport. For Use With All QLX-Series Stands, QL-646, QL-746, QL-609, QL-610, QL-641, QL-642.