1, ordinary file according to the shape of the file cross-section is divided into flat file, square wrong, triangular file, half-round file and five kinds of round file, flat file is used to file the plane, rounded surface and convex surface. Square file used to file square holes, rectangular holes and narrow plane. Triangle file is used to file the inner corners, triangular holes and flat surfaces. Half-round files are used to file concave arcs and flat surfaces. Round file is used to file round holes, small radius concave arc and ellipse.
2, special file used to file parts of the special surface, there are straight and curved two kinds.
3, shaping file (assorted files) is suitable for repairing small parts of the workpiece, there are many various cross-sectional shape of the file to form a set.