Space-Saver Triple-Monitor Upgrade Kit provides easy upgrade to the Lorell Space-Saver Dual Monitor Arms with Column Desk Mount. It allows you to add a third monitor that is fixed to the column in the center, using the included middle head. With the included two extension links for your Dual Monitor Arms, the Triple-Monitor Kit lets your existing system support three monitors up to 27" typical diagonals. The added third monitor in the middle will be able to move up and down along the column. Weight capacity is 20 lb. per monitor.