Carbide file is a metalworking, woodworking and plastic working tool with carbide as its abrasive surface. The cut of the carbide file refers to how fine its teeth are. They are defined as (from roughest to smoothest), rough, middle, bastard, second cut, smooth, and dead smooth.
A single-cut file has one set of parallel teeth while a cross-cut or double-cut file has a second set of cuts forming teeth. 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, etc. Most files have teeth on all faces, but some specialty flat files have teeth on only one face or one edge, so that the user can come right up to another edge without damaging the finish on it.
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