The Crescent Nicholson flat double/single-cut bastard filees with an American pattern are ideal for machinists, machinery builders, ship and engine builders. The files can be used effectively by repairmen and others who require rapid removal of metal. The rectangular cross section allows you to smooth and sharpen straight surfaces, while slight taper in width towards the file's point creates ease of access in slots. Bastard cut, American pattern flat file Ideal for machinists, machinery builders, ship and engine builders Can be used effectively by repairmen and others who require rapid removal of metal Rectangular cross section allows you to smooth and sharpen straight surfaces, while slight taper in width towards the file's point creates ease of access in slots Double-cut on the sides for rough filing and single-cut on the edges for a smooth finish