Farmer's Own File material: T12 carbon steel size:4",6",8", ... file, round file, half-round file. engineer file,mill file, farmer sickle file, woodworker file .These files could be used to ... to remove the carbon from the steel to raise file's cutting ability and also extend the files use time. We ... also have a good rap group on the file's tooth type to make the files be used more conveniently ...