Feature: 1. Efficient Thread Repair: The thread repair file is specially designed for repairing SAE UN threads effortlessly. It provides fast and efficient thread repair for pipes, automotive, engineering, and home projects. 2. Durable and Reliable: Made from 45 steel, this thread repair file is built to last. The steel construction ensures its durability and reliability, making it a reliable tool for long term use. 3. Wide Range of Sizes: With thread sizes ranging from 12 to 28, this thread repair file offers a wide range of options to meet your various repair needs, ensuring compatibility with different threaded parts. 4. Straight Groove Design: The thread repair files feature a straight groove design, allowing for precise and accurate thread repair. This design ensures that the repaired threads are aligned correctly for a secure and firm connection. 5. Versatile Application: The thread file is suitable for various applications, including pipe fittings, automotive repairs, machinery, and home projects. It is a versatile tool that can be used in different industries and settings. Specification: Item Type: Thread Repair File Set Material: 45 Steel Thread Sizes: 12, 13, 14, 16, 18, 20, 24, 28 Hardness: HRC48-50 Groove Type: Straight Groove. Package List: 1 x File