Ergotron WorkFit-LX2-SitStand Dual Monitor Workstation Desk Mount Desk Mount Sit-Stand Workstation for Dual Monitors For Screen Sizes 17" to 24": outside width of the monitor should be 14" to 24.5" Extend the monitor up to 33" horizontally and has 20" of vertical adjustment Portrait to Landscape Rotation with 62" of side to side motion Weight Capacity: 4 - 12 lbs per monitor