That video shows it exactly. I could have looked it up but I'm working on something (putting my office back together after ceiling reconstruction) and just took time to snap the photos and load them to link.

This one came from my father's house, it has been out in my garage in a tool chest with screwdrivers and I only noticed today that it was something other than a reversible driver of some sort.

So what oddball tools are sitting there waiting to be discovered in your tool chests?