The double-cut is applied to most of the files used by the machinist, and, in fact, to most of the larger number in general use.
When there are two series of ridges crossing each other the file is double-cut, which is the file best suited for iron and steel.
The double-cut file presents sharp angles to the filed surface, and is better suited for hard metals.
The Clark double-cut countersink (for wood only) cuts smoothly and is easily sharpened.
The few files of this kind which are now made are usually blunt and double-cut.
