Use of rivet nuts: Rivet nuts provide a simple and effective way to join materials with the benefits of internal threading in a variety of applications (ideal replacement for weld nuts). GALVANIZED STEEL: Rivet nuts are made of steel with high hardness and excellent corrosion resistance, durable and not deformed for long time use. NUTSERTS ADVANTAGES: Grooved Cylindrical Brackets High strength, open end allows screw length to be varied, countersunk head so load is spread over large area and flush to surface. INSTALL NUTS INSTALLATION : just drill a hole according to the size of the rivet nut and use a rivet gun to turn the nut into the hole. WIDE APPLICATION: Captive nut not only can be used in mechanic, car, marine, industry, but also great for bicycle, DIY work.