The Height Adjustable Sit to Standing Desk Riser and Converter offers the versatility you need to get through your work day. Now you can sit part of the day or stand to take advantage of all the health benefits that come with standing and moving around. With the 40 wide , you and your associates will become healthier and more productive. It fits over your current desk with no need to buy additional furniture. With its spacious 40 W x 23.6 D work surface, you can hold up to 2 large monitors, a laptop, and more. It also includes an retractable keyboard tray that measures 25.5 W x 11.25 D that is an ergonomic 4.5 below the desktop. Enhanced Vertical Range rises up to 20 and down to 5, to optimize the ergonomic work position for people of all heights. Straight up and down motion minimizes required depth (23.25). Gas piston assist allows you to easily raise and lower up to 40lbs. Grommet hole allows you to route cables or add an optional single or dual monitor arm such as the Rocelco or . ?It works with your existing desk or create a complete standing desk with the optional Deluxe Floor Stand . Fully assembled and ready to go!