It contains 7 different sizes coarse threaded die (M3, M4, M5, M6, M7, M8, M9, M10, M12), which meet your different requirement. With this screw die and wrench set, the thread processing will become more easily and precisely. The die size is M3x0.5, M4x0.7, M5x0.8, M6x1.0, M8x1.25, M10x1.5 and M12x1.75 respectively. The length of the die spanner approx. is 7.68 inch. Die set is made of durable alloy steel, which is superior to other carbon steels. It features strong stability, good impact toughness and fracture toughness. It is suitable for external thread cutting, processing, repair and so on. Great for bicycle repair, assemble furniture, machinery manufacturing, etc. It is a necessary tool for hand tapping operation. Use of Product- An 8-piece metric die set with an adjustable wrench holder is a versatile tool kit used primarily for cutting external threads on rods, bolts, or other cylindrical objects. Dies in the set are used to create external threads on cylindrical workpieces. They are typically used with the adjustable wrench holder, which provides a stable grip and allows for precise rotation during the threading process.