Eachbid Magic Autorotation Rotating Nut Bolt Screw Close Up Magic Gimmick Trick Bolt itself contains internal organs and cells. Take the bolt and nut out and let the audience screw the nut onto the bolt. Ultra energy is applied to the bolt,Obviously you'll see the nutbegan to spin up, Until it completely unscrew to come off the bolt. Bolts and nuts, before or after performance can be handed over to the audience to check. Please allow few error due to manual measurement, thanks.