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Knurling is widely used in industry for many applications. Some of these include decorative and "grip" surfaces, repair of undersized shafts and oversize bores, and driving serrations and splines. The word "knurling" applies to both the method of production, and the rolled section on the part. It is usually produced by forcing a knurling die into the surface of a rotating part, displacing material from the original diameter. Another method is “cut knurling” which uses special cut knurl holders, and cut type knurl wheels.