"Fan's Automatic Open and Close Screw-Nut Mechanism" is a great invention in mechanical screw-and-nut history and has made an important breakthrough on the long-term unsolved world problem during the last 100 years. The world experts appraised it as a revolutionary invention to the traditional screw-and nut. Fan's Invention is widely used in many fields and granted patent rights in more than 20 countries such as China, United States, Germany, Australia, Canada, France, Italy, England, Japan, etc. Its products have been awarded many gold medals in the international fairs. For the time being, There are 10 series Fan's quick products such as "Fan's Quick Bench Vice", "Fan's Quick Car Jack", etc. They are granted GS certificates and CE certificate.