Aluminum file Material Applications Aluminium Brass Bronze Cast Steel Copper Grey/Nodular Cast Iron (GG/GJL GGG/GJS) Other non-ferrous metals Plastics Steels up to 1 200 N/mm ( less than 38 HRC) Zinc File Coarseness Second Cut File Style American Pattern File File Type Aluminum file Profile Shape Half Round Face Cut Style Double-Cut Edge Cut Style Safe File Length without Tang 12 in Thickness 11/32 in File Diameter 3/8 in File Width 3/8 in Number of Cut Edges 2