New and High Quality. A spectator screws a nut onto a bolt about half way up and then you hold it at your fingertips. The audience can for always see your empty hands. Suddenly the nut starts to rotate and unwind along the bolt. It looks like some ghostly power is screwing the nut and bolt. It can be done visually or under a cup or handkerchief. Nothing to hide in your hands. No complicated body hook ups. Can be immediately repeated as many times as you want. Fully examinable before and after the effect. Easy battery replacement. No clothing limitation. You can wear short-sleeves. You don'for t even have to be wearing clothes! No switches are required. In fact, no sleight of hand is needed. No suspicious moves. Audience themselves screw the nut onto the bolt and also you can hand the bolt and nut to them immediately after the effect. Material:Metal Battery:2Pcs button batteries(included) Dimensions :5.3*1.1*1.1cm /2.09"*0.43"*0.43" Quantity:1Set Note Size for manual measurement, there may be a 0 to 2 for cm error, belongs to the normal phenomenon. And due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes(no retail package) 1Set x Nut Off Bolt Magic Set(included batteries)