If the nut of a product needs to be installed on the outside, and the space inside is too small to allow the pressure head of the riveting machine to enter the riveting and pumping and other methods can not achieve the strength requirements, then the riveting and riveting are not feasible. Must use the pull rivet for each thickness of the plate, pipe (0.5MM-6MM) fastening field. The use of pneumatic or manual pull rivet gun can be riveted at once, convenient and firm; replace the traditional welding nuts, to make up for the metal sheet, thin tube welding easy to melt, welding nuts are not smooth and other deficiencies.