1High Strength Material: Thread chaser metric kit is made of carbon steel material, high hardness, beautiful appearance, not easy to rust, stable performance and has long service life. 2Function: Used to repair damaged screws and tools that cannot be used due to damaged screws, allowing you to repair damaged external threads or internal threads on nuts, bolts and studs. 3Professional Design: This toolset provides access to axle threads on spindles of eight popular die sizes. Suitable for use with sockets or keys. Color coded for quick visual identification. 4Multipurpose: Rethreader tap die kit is ideal for creating new threads or repairing damaged threads on most metals such as cast iron, steel, aluminum, copper, etc. 5Storage Box: All thread repair tools are stored in the blow mold box, which can withstand high strength extrusion without deformation and protect the tools from damage.