FOR TYPE 40 ALUMINUM EXTRUSION PROFILES: These hammer head nuts are mainly used for type 40 aluminum extrusion profiles. SIMPLE to USE: They are simple to use and convenient for connecting aluminum profiles to other parts. SUPERIOR QUALITY MATERIAL: These T nuts are made from high quality carbon steel, these nuts have high hardness and long service life. PRACTICAL AND PRACTICAL: There are a total of 20 pieces of nut that you can use for many projects. The surface is zinc plated for good rust resistance and better performance. AFTER SALES GUARANTEE: All products sold by us, we will give you strict quality assurance. If there is any quality problem, please contact us. Features: Made of high quality carbon steel, these nuts have high hardness and long service life. The surface is zinc plated for good rust resistance and better performance. There are 20 pieces of nut in total that you can use for many projects. They are simple to use and convenient for connecting aluminum profiles to