A file's teeth can range from rough, coarse and bastard (meaning intermediate) to second-cut, smooth and dead smooth. A single-cut or mill file has one set of parallel teeth,
70-291 exam while a cross-cut or double-cut file has a second set at an angle to the first. In Swiss-pattern files the teeth are cut at a shallower angle, and are graded by number, with a number 1 file being coarser than a number 2,
640-822 exam etc. Most files have teeth on all faces, but some specialty flat files have teeth only on the face or only on the edge, so that the user can come,
350-030 exam right up to another edge without damaging the finish on it.
