Features All cutting teeth are precision CNC machined and carefully heat treated to a hardness of 60HRC for best tapping performance. Very well suited for creating new threads or repairing damaged threads on plastic and aluminium. A good tool for home, garden and garage mechanics. This tap and die set is made of hard alloy material which ensures high hardness and long service life. Suitable for threading carbon steel, cast iron, aluminum, brass, copper, stainless steel and other metals. Ideal for re-threading fasteners and mounting holes in car and machine repairs. Offers more comfort. Specification: Item Type: Metric Tap & Die Set Material: hard alloy Purpose: Hand tool kit Function: cutting, adjusting, for metalworking System: Metric Die Specifications: M3,4,5,6,7,8,9,10,12 Package list: 9 x Threading Die 9 * Taps 1 x Die Key 1 * Tap Wrench 1 x plastic box Package List 9 x Threading Die 9 x Screw Tap 1 x Die Wrench 1 x Tap Wrench 1 x Plastic Box