The performer shows a solid brass nut, which can be threaded on to a lace, string, or even over a knitting needle. Yet the nut can be made to penetrate off the string or needle in an instant. This is a very fine piece of mechanical magic. You will be delighted with the clever working of this item. We supply you the special fake nut, a matching ordinary nut, both precision made in solid brass, along with full instructions and routines .