Features 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. 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. 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. 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. 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 Package List 1 x File