1、All cutting teeth have been accurately CNC processed and accurately heat treated to hardness 60 HRC for best threading performance. 2、Very suitable to create new threads or repair damaged threads on plastic, aluminium. A good tool for home, backyard, garage mechanic. 3、This tap and die set is made from hard alloy material, which ensures high hardness and long service life. 4、Suitable for thread processing of carbon steel, cast iron, aluminum, brass, copper, stainless steel and other metals. 5、Ideal for rethreading fasteners and fastener holes for auto and machinery repair. Providing more convenience. 9 x Threading Die9 x Screw Tap1 x Die Wrench1 x Tap Wrench1 x Plastic Box Item Type: Metric Tap and Die SetMaterial: Hard AlloyPurpose: Hand Tool KitFunction: Cutting, Adjustment, for Metal ProcessingSystem: MetricDie Specifications: M3,4,5,6,7,8,9,10,12