Features Made from high quality carbon steel, these nuts have high hardness and a long service life Surface is plated with nickel for good rust resistance and better performance There are total 50pcs 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 European standard aluminum extrusion profiles Features: Made from high quality carbon steel, these nuts have high hardness and a long service life. Surface is plated with nickel for good rust resistance and better performance. There are total 50pcs 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 European standard aluminum extrusion profiles. EU20 is used on profiles with 6mm slot, while EU30 is used on profiles with 8mm slot. Specifications: Material: Carbon steel Surface Finishing: Nickel plating Type: EU20-M4, EU20-M5, EU30-M4, EU30-M5, EU30-M6 (Optional) Quantity: 50pcs Package Includes: 50pcs x Nuts Package List