You hand the thumb stocks to a spectator. Instruct him to loosen the nut that holds the two halves together. The spectator places their thumbs into the holes and the nut is tightened snugly.
The spectator can not remove their thumbs.
You loosen the nut and place your thumbs into the stocks and then the spectator tightens the nut to make sure you can not escape.
You are then able to perform many different in and out escape routines and stunts.
Perfect for comedy or serious routines.