This versatile, sit-stand mount for a single monitor transforms any fixed-height desk into an active one with a minimalistic design that includes Humanscale Technology. Innovative cord management and a premium-tier articulating arm ensure an all-around range of motion. Clamps allow you to quickly and easily attach the Extend Sit-Stand to the back edge of any worksurface. Main assembly holds 25 lb. of weight and provides 20" of height range and 5.5" of vertical monitor adjustment (three settings). Radius from the arm pole to the front of the keyboard platform is 40". Keyboard platform measures 25-1/2" x 12-1/2".