Features 1、Made from zinc plated carbon steel which provides strength, corrosion protection and long service life. 2、With open end, small flange, round hole, threaded inner wall and partial anti-skid surface, this flat head rivet nut has a good performance as fastener. 3、Convenient to install, designed to form a bulge on the back side of the panel as a screw is tightened in its threads. 4、There are seven different sizes from M3 to M12 that you can choose as needed for various purposes. 5、Each set includes many pieces of rivet nuts so you don't have to go to hardware store searching rivet nuts for a while. Specification Features: Made from zinc plated carbon steel which provides strength, corrosion protection and long service life. With open end, small flange, round hole, threaded inner wall and partial anti-skid surface, this flat head rivet nut has a good performance as fastener. Convenient to install, designed to form a bulge on the back side of the panel as a screw is tightened in its threads. There are seven different sizes from M3 to M12 that you can choose as needed for various purposes. Each set includes many pieces of rivet nuts so you don't have to go to hardware store searching rivet nuts for a while. Specification: Material: Carbon steel Surface Finishing: Zinc plating Color: As pictures show Type: Flat head rivet nuts Size and Quantity: M3 60pcs M4 50pcs M5 35pcs M6 25pcs M8 10pcs M10 5pcs M12 5pcs Package list: 1 * Set of Rivet Nuts (190Pcs) Package List