Part of the Lorell Electric Height-Adjustable Workstation, this Third-leg Add-On Kit expands your worksurface to make an L-shaped desk that is height-adjustable. It attaches to the Lorell Quadro Three-tier Sit/Stand Frames that adjust from 24" to 50" high. Adjustment speed is 1.3" per second. The sit/stand desk frame adjusts quickly, smoothly and quietly with a gentle push of a button. Sit-to-Stand design is perfect way to increase your circulation, comfort and productivity. Maximum capacity is 275 lb. Kit includes tabletop support beams, one square column leg and standard 27-1/2" foot for added stability on tabletop depths ranging from 24" to 30" tabletops (sold separately)..