Built to Last: Our thread chaser set is crafted from premium steel with a finely ground surface, HRC 55-62. This ensures excellent corrosion resistance and long-lasting durability, making it a reliable tool. 61-Piece Precision Repair Set: This rethreading tool kit is designed to trace and repair worn or damaged threads. It serves as both a thread restoration and cleaning tool, effectively removing stubborn dirt and corrosion without compromising thread integrity. The 61-piece kit includes 28 dies, 28 taps, and 3 thread files, designed to restore threads on rusted fasteners as well as bolt holes on cylinder heads, engine blocks, and other vehicle components. Comprehensive Size & Color-Coded Design: The thread chaser kit includes three standards (UNF, UNC, and Metric) with color-coding for quick visual identification