Features: 1Made of high quality carbon steel with high carbon content it can be better attached to various objects. 2Nut has a hardened appearance to provide high strength load bearing threads and a galvanize appearance. 3Rivet Nuts can be used for almost all construction purposes such as steel plastic glass fiber and other DIY projects. These tools are also very suitable for all kinds of professional and amateur workers and repairmen to use Even DIY enthusiasts can choose to use. 4Equipped with a strong plastic packaging box made of high quality materials which can effectively bear the weight of the entire packaging. It is safe and easy to carry. 5Threaded Inserts M3 is suitable for the fastening field of various metal plates pipes and other manufacturing industries. It is widely used in home appliances and furniture products such as construction. Specification: Item Type: Threaded InsertsMaterial: SteelWeight: Approx. 211g / 7.4ozAppearance Treatment: Color GalvanizeProduct Specifications: M3 M4 M5 M6 M8Product Quantity: 30 x M330 x M4 20 x M510 x M610 x M8 Package List: 30 x M330 x M420 x M510 x M610 x M8