Steel

A file is a tool used to remove fine amounts of material from a medium. It is common in woodworking, metalworking, and other similar trade and hobby tasks. Most are hand tools, made of a case hardened steel bar of rectangular, square, triangular, or round cross-section, with one or more surfaces cut with sharp, generally parallel teeth. A narrow, pointed tang is common at one end, to which a handle may be fitted.
 
 
Detail of a double-cut flat file showing cutting surfaces milled on both wide and narrow faces
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