Features 1、Made from high quality carbon steel, these nuts have high hardness and a long service life. 2、Surface is plated with zinc for good rust resistance and better performance. 3、There are total 20pcs nut that you can use for many projects. 4、They are simple to use and convenient to connect aluminum profiles to other parts. 5、These hammer head nut are mainly used for type‑40 aluminum extrusion profiles. Specification Features: Made from high quality carbon steel, these nuts have high hardness and a long service life. Surface is plated with zinc for good rust resistance and better performance. There are total 20pcs nut that you can use for many projects. They are simple to use and convenient to connect aluminum profiles to other parts. These hammer head nut are mainly used for type-40 aluminum extrusion profiles. Specifications: Material: Carbon steel Surface Finishing: Zinc plating Type: Type-40 Quantity: 20pcs Weight: 243g~300g(approx.) Package Includes: 20pcs x Nuts Note: Please allow small size error due to manual measurement. Thanks for your understanding. Package List