Our Zilker Dual Monitor Arm offers 360 degrees of rotation, 20" of forward reach, and a 6.88" - 19.38" height range, allowing you to place your monitors right where you need them so you can work in comfort, without stressing your neck, shoulders, and eyes. Once you get the monitor at the right height and distance, the monitor itself can then be rotated from landscape to portrait, and tilted up or down and side to side to further customize your setup. Arm accommodates two monitors up to 39.5" wide each (using wider monitors will result in some loss of motion, however the vast majority of monitors on the market will enjoy full range of motion as most are under 30" wide), from 4.1 to 11 pounds, and comes with two mounting options - a clamp mount that attaches to the edge of desks 0.75" - 3.75" thick and a bolt-through mount, which allows you to add a hole from 0.4" to 3.15" in diameter anywhere on your desktop, for custom placement on desks 0.6" - 2.13" thick. Finally, there's a quick-release VESA clip for easy installation (no more awkwardly holding the monitor up with one hand while installing screws with the other!) and a rotation stop pin that keeps the arm from rotating past the edge of your desk, to avoid collisions with walls and to keep it from rotating into walkways in open office layouts. Want a full 360 degrees of rotation? Simply remove the pin!