This metric master tap and die set contains metric high-carbon steel plug taps and hexagon dies. The high quality high-carbon steel allows for long life. This set contains the following sizes of taps and dies: M3-.50, M3-.60, M4-.70, M4-.75, M5-.80, M5-.90, M6-1.00, M7-1.00, M8-1.25, M9-1.00, M9-1.25, M10-1.25, M10-1.50, M11-1.50, M12-1.50, M12-1.75. It also contains a1/8-27 NPT tap and two t-handle tap wrenches. Packed in a high quality plastic case.