Specification: M3 M4 M5 M6 M7 M8 M9 M10 M12 M13 M14 M16 M18 M20. Suitable for mold machining steel, cast iron, copper, aluminum, zinc, etc.Not suitable for stainless steel. Die can be installed in DIE wrench using manual processing threads can also be mounted on the die holder on the machine to use;.