Size:T Nuts Type 40 M6 Features: Manufactured; These nuts are made of high quality carbon steel and have hardness. high and long service life. The surface is coated with zinc for good corrosion resistance. rust and better performance. There are 20 pieces of nuts in total, you can use them for many projects. They are easy to use. simple and practical for connecting aluminum profiles other parts. These hammer head nuts are mainly used for Type 40 aluminum extrusions. Specifications: Material: Carbon Steel Surface Finish: Zinc Plating Type: Type-40 Pattern: M4, M5, M6, M8 ( optional) Quantity: 20pcs Weight: 243g~300g (approx.) Package Includes: 20pcs x Nuts Note: Please allow small size errors due to manual measurement. Thank you for your understanding.