The spring-loaded bumper means that you can efficiently increase and reduced your desk from a standing height towards the height from the desk, table, or System on which you choose to place the converter. And when you select to pack it up, it folds fully flat. Why reviewers adore it: https://standingdeskbig04825.59bloggers.com/38557099/5-simple-statements-about-standing-desk-uplift-explained