The Rocelco R DADTR-40 Height Adjustable Sit-to-Standing Desk Riser offers flexibility to switch between sitting/standing. With a 40" W x 23.6" D work surface, it accommodates up to two large monitors, a laptop and more. The retractable keyboard tray (25.5" W x 11.25" D) is ergonomically positioned 4.5" below the desktop for comfort. The EVR Enhanced Vertical Range adjusts from 5" to 20" to suit users of various heights, with a straight up-and-down motion that minimizes desk depth (23.25"). A gas-piston assist allows easy height adjustment up to 40 lb. Fully assembled and ready to use, it's a simple, affordable way to enjoy the health benefits of standing while working. Free up desk space by using the conveniently placed grommet hole to route cables and install the included R DM2 dual monitor mount. Securely attach your dual screens, up to 27"/17.6 lb. each with standard 75x75mm or 100x100mm mounting pattern. Arm tilts + or - 45 degrees, swivels 180 degrees and rotates 360 degrees. Monitors can be mounted in landscape (horizontal) or portrait (vertical) position. Adjustable height along pole for ideal ergonomic position. Cable management clips come included. Easy height adjustment up to 17.75" and extension from pole to monitor up to 16.75". The double articulated arm allows you to position the screen for your perfect viewing angle.