Flat file Material Applications Aluminium Brass Bronze Cast Steel Copper Grey/Nodular Cast Iron (GG/GJL GGG/GJS) Steel Steels up to 1 200 N/mm ( less than 38 HRC) Zinc File Coarseness Bastard Cut File Style American Pattern File File Type Flat file Profile Shape Rectangular Face Cut Style Double-Cut Edge Cut Style Safe File Length without Tang 12 in Thickness 9/32 in File Diameter 1 3/16 in File Width 1 3/16 in Number of Cut Edges 2 Rigidity Rigid Taper Blunt