1.  The commonly used specifications are collected in an iron box, which can be applied to a wider range of scenario-material workpieces and through-hole threading applications.
2.  Use a variety of fields, bicycle repair, mechanical repair, furniture repair, car repair, motorcycle repair, disassembly parts.
3.  Suitable for a variety of materials, mostly used in abrasive steel, iron, cast iron, carbon steel, metal copper and other materials cutting.