Grobet USA Swiss Pattern files are designed for detail work, delicate finishing, and precise metal removal. Compared to American Pattern files (Engineers' files) Swiss Pattern Precision files have strict manufacturing tolerances, are uniform in taper, points, sharp edges, dimensions and flatness. Grobet files are made of the finest heat-tempered, chrome alloy steel. They are available in a variety of styles, shapes, sizes and cuts. The files are measured in length from the point where the teeth begin to the end of the file. The handle section (tang) is not included in the file length.