For professionals and DIYers who need precise thread cutting on bolts and screws, this tool set delivers reliable results. The handle is made from bearing steel and the chuck from alloy steel for durability and long service life. It covers a range of bolt sizes and is suitable for bicycle , furniture assembly, and machinery manufacturing. The speed steel Ttype wrench is designed for efficient, accurate thread cutting with minimal tool wear. Use cases: Bicycle : rethread or seatposts, brake bolts, and crank bolts. Furniture assembly: create clean, strong threads for metal frames and hinges. Machinery and engine maintenance: rethread damaged fasteners on small engines and equipment. Why this set stands out: Function: precise thread cutting with clean engagement. Compatibility: works with common bolt sizes; includes multiple sizes. Material and performance: speed steel Ttype wrench, alloy and bearing steel construction for durability. Specifications: Materials: bearing steel handle, alloy steel chuck, speed steel tools. Includes: multiple sizes to fit standard bolts and screws.