Feature: 1. VERSATILE THREADING SOLUTION: This tap and die set is used to create new threads, chase existing threads, or repair damaged threads on most metals like aluminum, brass, bronze, cast iron, mild steel, carbon steel, stainless steel and more. 2. INDUSTRIAL GRADE DURABILITY: Constructed from hardened GCr 15 alloy steel, this set offers maximum strength and durability. It meets ANSI ASME B1.1 standards, ensuring you receive the tool kit that can withstand extensive use. 3. PRECISE ENGINEERED CUTTING TEETH: All cutting teeth are precisely CNC machined and accurately heat treated to achieve a high hardness of 60 HRC, providing superior threading performance and ensuring clean, accurate threads every time. 4. USER FRIENDLY DESIGN: Designed for ease of use, this tap and die set is suitable for both professionals and enthusiasts. The intuitive design allows for quick setups and efficient use, making threading tasks simple and effective. 5. COMPREHENSIVE RANGE: This set includes a wide variety of taps and dies to accommodate different sizes and threading requirements, making it a must have addition to any toolbox for tackling various metalworking projects. Specification: Item Type: Tap and Die Set Material: Alloy steel Size: 4 to 1/2 inch Package Including: Includes unc cool, UNF-FINE, and NPT threads Includes a full range of most commonly used tap and die sizes for unified screw threads (UN-Series) Coarse Thread (UNC): 4-40, 6-32, 8-32, 10-24, 12-24, 1/4-20, 5/16-18, 3/8-16, 7/16-14, 1/2-13 Fine Thread (UNF): 10-32, 1/4-28, 5/16-24, 3/8-24, 7/16-20, 1/2-20 Pipe Thread (NPT): 1/8-27. Package List: 1 x Tap and Die Set (40pcs)1 x Blow Molded Case