This is a 12-piece vintage needle file set manufactured by the Heller Tool Co., which was based in Newcomerstown, Ohio.Product DetailsType: These are Swiss pattern needle files, characterized by their precision and smaller size compared to standard files.Purpose: These tools are primarily used by jewelers, watchmakers, hobbyists, and machinists for fine finishing, shaping, and deburring small parts.Assortment: A typical set includes various profiles to handle different geometries, such as:Round and Half-RoundFlat and SquareThree-square (Triangular)Knife and BarretteDesign: These files feature knurled shanks, which provide a better grip when used by hand, though they can also be fitted into a separate handle if desired.