20-Piece Tap and Die Set Thread Creating and Repair Tool Kit with Storage Box Threading Kit / Thread Cutting Set Long Life Durability: Professional industrial grade steel material for long-life durability and good tool function maintenance. A 20-piece Tap & Die set is a tool kit used for threading nuts and bolts. It typically includes 9 taps and 9 dies, as well as a tap wrench and a die wrench, which are used to manually turn the taps and dies. Taps are used to create internal threads in nuts or holes, while dies are used to create external threads on bolts or rods. The set usually contains taps and dies in different sizes, allowing users to thread nuts and bolts of different diameters and pitches. These sets are commonly used in automotive, plumbing, and construction industries, as well as for DIY projects. They are made from high-quality materials, such as carbon steel or high-speed steel, to ensure durability and longevity. Wide application: Precisely correct or repair damaged threading, or create internal and external threading holes on wood, brass, copper, aluminum, iron, carbon steel, etc. Perfect threading manufacturing process and good surface heat treatment: Teeth of the tools are precisely machined and qualified surface heat treatment to hardness 60 HRC for best threading performance. Features: - This alloy steel tap and die set helps you overcome damaged nuts, bolts and threads. When a replacement bolt is hard to find, this tap and die set makes it easy to remove imperfections from threads. - This tap and die set includes a wide assortment of tools, they are made from hardened, precision-ground, polished alloy steel, each piece under a rust-resistant satin finish that makes smooth thread cuts with less friction. The set is of metric size. Material: alloy steel, metal Color: Silver Type: Hand tools, combination tools, other hardware tools Classification: Hand tools, wrench, accessory tools, household tools. What's in the box 1 x 20 Piece Tap & Die Set