I remember these well. They were made years ago by Viennamagic when they were a strong magic business. We imported them to Germany and sold quite a few as they were offered at a very good price and it was a great little Close-Up effect that was hard to explain. When I recently purchased the inventory of a European shop that had closed I was lucky enough to obtain a couple hundred of them.
You receive a small round container, a lid and three uniquely colored screws threaded with nuts, all of which you ask your spectators to thoroughly examine. You casually ask them to name one of the screws. Next you clearly place all three screws into the container which has been in full view the entire time, cap it, shake it, then hand it to the spectator to shake as well. Upon removing the top and pouring out the contents, they will find that the selected screw is the only one separated from the nut! All can be examined before and after the effect.
Who comes up with this stuff? Killer close-up! This effect is easy to accomplish. Made in Europe!
Instant re-set right in front of the audience!
English instructions included!
Colors may vary from picture.





