me too only used it once...its more of a tool for someone working in a machine shop who comes across weird engines where theres not always room for hands and eyes
197706 is what we used to call a church key. for obviously satyrical reasons. 197707 is something to pry with, though i forget what specifically it was made to pry at. probably something on a car.
Yes. We called them skeleton keys, but that's probably the correct name. Had to use these to lock the old wooden doors At the house I grew up in.