High Quality MaterialThe metric tap set is made of hard alloy steel with chrome plated surface. Heat treated for hardness, Rockwell hardness HRC59-62. Which are durable and have a hardness of high quality, non-deformation, anti-rust and anti-corrosion. Metric Tap and Die Set This 12pcs metric tap and die set contains 5pcs taps and 5pcs dies, helps to cut and clean internal and external threads in common conventional sizes from M3 to M12. The set also includes 1pcs long handle tap, 1pcs adjustable Combined Tap and Tap Wrench This set comes with 5 taps and a tap wrench. The tap is mainly a tool for making nuts. After selecting the right tap model, it can be polished with our tap wrench and the tap placed horizontally. Screw it vertically into the tap. After the wrench is fixed, turn the knob one to two turns with both hands. External Thread Machining Die and Wrench In this set, we are equipped with 5 dies and a die wrench. The die is mainly used to polish and repair the outer contour of the screw. The pattern of each die is different. Choose the appropriate die to fix In our die wrench, after tightening with a screwdriver, fix the screw on the machine and screw the die into the screw. Wide ApplicationThese tools are perfect for correcting or creating internal and external threads in wood, copper, aluminum, iron, carbon steel and more. This metric tap set is ideal for screwing fasteners, car and machine mounting holes.