Features Efficient Repair: The professional thread restoring file is designed to quickly and effectively restore damaged external threads on studs, bolts, screws, plumbing pipe and pipe fittings. Versatile Use: The thread restorer file can meet different sizes of thread repairing needs and is suitable for various pipelines, engineering and home decoration projects. Durable and Reliable: Manufactured from high strength steel materials, the thread restoring file promises durability and reliability to assure worry free use. Specification of Thread Sizes: The file has a range of thread size markings 0.75, 1.0, 1.25, 1.5, 1.75, 2.0, 2.5, 3.0, and hardness of HRC48‑50. Straight Groove Design: The file incorporates a straight groove design that aids in accurate, precise filing and teeth correction for maximum efficiency. Specification: Item Type: Thread Restoring FileMaterial: 45#steelThread Size: 0.75, 1.0, 1.25, 1.5, 1.75, 2.0, 2.5, 3.0 Hardness: HRC48-50 Geometry: Straight groove Package List:1 x Thread Restoring File Package List 1 x Thread Restoring File