The use of diamonds in this manner allows the file to be used effectively against extremely hard materials, such as stone, glass or very hard metals such as hardened steel or carbide against which a standard steel file is ineffective.
A narrow, pointed tang is common at one end, to which a handle may be fitted.
Component parts were roughly shaped by forging, casting, and by primitive machining operations.
These components were then individually hand-fit for assembly by careful and deliberate filing.
Steel files are made from high carbon steel There is no unitary international standard for file nomenclature; however, there are many generally accepted names for certain kinds of files.
A file is "blunt" if its sides and width are both parallel throughout its length.
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 diamond shaped cutting surfaces.