Thread Repair Tool Kit: Restore old, ed nuts, bolts, and screws with damaged threads, and create new threads effortlessly, ensuring seamless repairs and maintenance. Wide Application: Suitable for various materials such as cast iron, steel, aluminum alloy, and copper, making it ideal for car maintenance and repairs. Comprehensive Set: Includes 7 thread taps, 7 thread dies, and 1 thread file of various sizes, providing versatility and meeting diverse work needs efficiently. Material: Crafted from carbon steel with high strength and proof properties, ensuring long-lasting and reliable performance. If you have any questions about the product, please feel free to contact us via email., Manufacturer: ASerZenith