The Nut Box by Joe Porper
Spectator is asked to thread a metal bolt into a brass nut, it takes 20-30 twists. Then it's the magician's turn. Taking the bolt from the spectator, in less than one second, the bolt literally "melts" through the nut. The spectator tries, but cannot do the same. Can be examined before and after trick. Comes in a presentation box as shown.