Knurling has a wide variety of applications in day to day use. It is most commonly used for decorative purposes and for serrating surfaces where components are locked or keyed together in unit assemblies. The term "knurling" designates both the process and the knurled portion of the work. Knurling is obtained by displacement of the material when the knurl is pressed against the surface of a rotating work blank. A knurled tooth is V shaped. Knurling tools are used for producing straight, diagonal OR diamond patterns, having teeth of uniform pitch on cylindrical surfaces.