This hook was a quick-and-dirty way to suspend Simon's cat over a cubicle desk, in the style of Mission: Impossible. Here is a link to the Simon's cat thing: https://www.thingiverse.com/thing:3753033

UPDATE - The new model (in the file) fits a cubicle wall that is up to 55mm across. The version shown in the photo is too small for the cubicle wall, at only 51mm.