Ring off Locked Bolt
A borrowed finger ring is placed on a bolt, a nut is screwed on and the tip of the bolt is padlocked, making it impossible to remover the nut. The magician removes the ring in an instant.
Precision machined brass props, with a solid bolt turned from 1″ hex rod, 2.5″ long, a 1″ hex nut, lock and keys, and full instructions.
See demo below
https://www.youtube.com/watch?v=kKISOvSEq6U