Borrow someones ring and lock it on the bolt with the large nut, then lock the nut on the bolt with the padlock. Put it under a hanky or behind your back and almost instantly, the ring can be freed and the nut is still locked on the bolt. Made of heavy brass. both photos show you how this works as there are not instructions. I'm certain you can come up with other uses for this clever and well made prop!
CONDITION: Very Fine, polish if you wish (Lacks Instructions)