This Arm Position your monitor for space-saving, comfortable viewing. Arm extends up to 20.5" in any direction. Tilts up to 90 degres in all directions. Three height levels. Easily assembled and attached. Sleek design fits desks up to 4" thick. Accommodates VESA compliant or "zero footprint" flat panels up to 20lbs. Save space by suspending zero-footprint flat panel monitor above desk. Arm extends, rotates, tilts, and swaps landscape and portrait for easy viewing. Three height levels for individual viewing comfort. Easy to assemble and attach without drilling. Clamp fits most desks from 1" to 4" thick.