You hand out a large gold plated key for inspection. Taking it back you polish it a bit with a pocket handkerchief and perform a mysterious piece of magic. You rotate the teeth of the key all around its body. Slide the teeth up and down the body of the key. You can even hand it back for inspection.
This is truly a well made piece of close-up magic that will fit into your pockets and can be performed at any time even when you are completely surrounded. To top it you can hand it out for inspection both before and after the inspection. Now that is incredible!
A great close-up prop at a great price!