Basic Calculator With Pen,10-Digit Desk Calculators,Mute Portable Calculator,Foldable Desktop Calculator Guangdong Jishengke Industrial Co., Ltd. , https://www.suronart.com There are many types of quick release nuts, and a new type of quick release nut (as shown) is now introduced. When working, put the nut 1 along the screw end of the flattened screw. When it is in position, tighten it clockwise. If it is rotated counterclockwise, the nut can be removed and the workpiece can be loaded and unloaded. Practice has proved that this quick release nut is simple and reliable.