SmartFit One-Touch Height-Adjustable Dual Monitor Arm makes it easy to find the proper monitor height & a neutral, comfortable posture with its patented SmartFit System & fully articulating design. It is tested to meet ANSI / BIFMA standards. Heavy-duty construction guarantees stability in every position. Gas-spring monitor mount allows you to effortlessly adjust your monitor's height, depth & angle (landscape to portrait). Height adjusts from 6-7/10" to 19-9/10". Counterbalance tension adjustment allows you to tighten or loosen the arm to accommodate a range of monitor weights with the same effortlessness & stability. It supports 13" to 34" flat or curved monitors weighing up to 19.8 lb. Monitor arm lifts your external monitors up & out of the way to declutter & clear valuable desk space. Cable-management system organizes & conceals cables. Use the C-clamp to mount on desktops up to 3-3/10" thick or mount using a grommet hole.