About Files
Files, also known as American-pattern and machinists' files, are used to remove material quickly.
Precision files, also known as Swiss-pattern files, are made to exacting measurements to ensure smoothness and are useful for finishing delicate and intricate parts.
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Rectangular Files

Files do not include a handle but do have a tang that fits into a handle. Length does not include the tang.
Single Cut—Surface has one set of diagonal teeth and is often used with light pressure to slowly remove material and sharpen tool-cutting surfaces.
Edges with no teeth protect adjacent surfaces when filing.
Tapered

Tapered

Single Cut