A rivet is a nail-shaped object with a cap at one end: in riveting, the parts are riveted together by using their own deformation or interference lines. There are many types of rivets, and they are not restricted by form. Plastic tree-shaped rivets are also called inverted tooth-shaped plastic rivets. The good elasticity of the tooth-shaped sheet can be directly pressed and installed manually in the round hole of the interference assembly. The tooth-shaped sheet can be adjusted and fixed according to the actual thickness. The inverted tooth design makes this rivet firmly fixed to the installed surface after installation and is not easy to be pulled out. It is suitable for fixing between soft materials. The core rivet is another type of rivet that is riveted on one side. When riveting, the rivet head is hit with a hammer to expose the nail core, so that it is flush with the end face of the nail head, and the riveting operation is completed, which is very convenient.