Adjust your desk to the max without having to commit to a complete workstation overhaul. Its unique design comes fully assembled and ready to use out of the box, giving you 15" of height adjustments for better working postures instantly. For use with Ergotron monitor arms. With the Ergotron WorkFit TL Sit-Stand Desktop Workstation, you can have a sit-stand desk in minutes, without the need for costly upgrades.UPLIFT monitor arms, keyboard trays, and CPU holders are not compatible with this converter model. Freestanding mount transforms existing workspaces into a sit-stand configuration. Adjusts using hand brake release levers Sturdy and solid platform allows for 15" of height adjustment. System does not protrude beyond the desktop. For use with Ergotron monitor arms. Ready to use out of the box (comes fully assembled).