The AST (Assenmacher Specialty Tools) 4-piece Metric Stud Extractor Set #201 is a hand tool set designed for removing stubborn studs in metric sizes. Manufactured by AST, this set includes various sizes of stud extractors to help mechanics and DIY enthusiasts easily grip and extract studs from a range of applications. The set is ideal for automotive repair tasks and is a valuable addition to any tool collection for handling challenging stud removal tasks.