Easy to install: practical to install, designed to form a bulge on the back of the panel when tightening a screw in its thread. Material: Made of zinc-plated carbon steel offering strength, corrosion protection and long life. Performance: With its open end, small flange, round hole, threaded inner wall and partially non-slip surface, this flat head rivet nut performs well as a fastener. Package includes: There are seven different sizes, from M3 to M12, which you can choose according to your needs. Different Sizes: Each set includes many rivet nuts, saving you from going to a hardware store looking for rivet nuts. for a while.