The Fellowes D Adjustable Monitor Arm is fully adjustable for optimum viewing control. It is easy to mount - clamp attaches to desktops 1-3" thick or through grommet holes at least 3-1/4" in diameter. The arm elevates monitors from 3-1/2 in to 16-1/2 in above the desk with a reach of 2-1/2 in-27". Tilts up or down +/-37 Degree and freely swings left or right (360 Degree rotation capability). Holds flat panel monitors up to 24 lbs Meets VESA mounting standards.