Precision thread cutting tool set for professionals and DIY enthusiasts who need exact bolt and screw threads. Durable construction: handle made from bearing steel; chuck made from alloy steel; built for repeated use in busy workshops. Broad compatibility: suitable for bicycle , furniture assembly, and machinery manufacturing. Versatile performance: effective across automotive and machinery tasks, from engine repairs to building machines. speed steel Ttype wrench set: designed to cut threads efficiently with reliable accuracy. Sizes and compatibility: includes a range of standard sizes to fit common fasteners; easy to switch between tasks with a simple, robust design. Use scenarios: Bicycle maintenance: thread bolts and components such as seat posts, stems, or derailleur screws to ensure secure fit. Furniture assembly: create or threads in hardware connections for desks, cabinets, and frames. Engine and machine work: or prepare bolt threads in engines, gearboxes, or fabrication equipment.