1、100% brand new and high quality. 2、These rivet nuts are made of carbon steel providing strength, sturdy and durable. 3、With open end, small flange, round hole, threaded inner wall and partial anti-skid surface, the flat head rivet nuts have a good performance of fastener function. 4、There are various sizes, M3/M4/M5/M6/M8/M10/M12, and it is normally chosen because of its low profile compared to other nuts. 5、Rivet nuts can be installed in many material, such as steel, plastic and fiberglass. Features: 100% brand new and high quality. These rivet nuts are made of carbon steel providing strength, sturdy and durable. With open end, small flange, round hole, threaded inner wall and partial anti-skid surface, the flat head rivet nuts have a good performance of fastener function. There are various sizes, M3/M4/M5/M6/M8/M10/M12, and it is normally chosen because of its low profile compared to other nuts. Rivet nuts can be installed in many material, such as steel, plastic and fiberglass. Specification: Type: Flat head rivet nut Material:  Zinc plated carbon steel Size & Quantity: M3   40pcs M4   40pcs M5   30pcs M6   20pcs M8   10pcs M10   5pcs M12   5pcs Weight: 410g / 14.5oz (approx.) Package list: 1 box * Rivet Nuts