These inserts are made of aluminum. They are designed for indoor and outdoor installations of non-structural panels like aluminum sheet. The knurl of the nutserts increases friction and prevents slipping. The aluminum prevents peeling, scratches, and corrosion. The bright silver color enhances the final appearance of a project. The durable transparent bag accommodates all nuts and prevents loss. Advantages of rivet nut:1. The surface is flat and beautiful without damaging the workpiece surface and bottom layer. 2. Strong bearing capacity, firm and reliable. 3. More reasonable structure and flexible product application. 4. Simple and fast operation.