This Ttype wrench set uses speed steel cutting edges with a bearing steel handle and an alloy steel chuck for durable, precise thread cutting on bolts and screws. Key benefits Accurate, clean thread cuts that minimize rework on fasteners Robust construction: speed steel cutting edges, bearing steel handle, alloy steel chuck for demanding use Wide size range with multiple metric sizes to fit common bolts and screws Ergonomic Thandle for steady control and comfortable use Suitable for professional workshops and DIY projects alike What you get and how it helps Function: precise metric thread cutting for bolts and screws Compatibility: works across bicycle , furniture assembly, and machinery maintenance Size and material: multiple metric sizes, built with durable steels for long service life Performance: reliable cutting power with consistent results across applications Use scenarios Bicycle maintenance: trim or bolt threads when fitting components or replacing fasteners Furniture assembly: create secure threads for cabinet hinges, brackets, and hardware Machinery servicing: perform accurate thread cuts on replacement bolts or custom fasteners in a workshop setting