With SmartFit, finding the proper monitor height for maximum comfort as easy as 1-2-3. Simply match your hand size to the color on the provided chart, set the height to your color, and you're done. The Kensington SmartFit One-Touch Height Adjustable Dual Monitor Arm makes adjusting each external monitor's height, depth, and angle effortless. With 6.7-19.9 (170 mm-505 mm) height adjustment, +/-90° swivel and monitor rotation, and +/-90° tilt adjustment, the product's fully articulating design gives you total control over the placement of your dual monitors, from side-by-side to vertically stacked. Its CounterbalanceTension Adjustment allows you to tighten" or loosen" each arm to accommodate a range of monitor weights with the same effortlessness and stability (Allen wrench included).