GDOES Sofia Gaiaschi, HORIBA Scientific, 16 rue du Canal, 91160 Longjumeau, France Introduction Drill bits are cutting tools used to remove material to create holes, almost always of circular cross-section. These kinds of cutting tools, used in wood or metalwork, are usually made from medium to high carbon steel (cast steel) which is hardened and tempered during the manufacturing of the tools. While the purpose of hardening is to enable the tool to resist wear and make it hard enough to cut other materials, tempering is carried out as a second step, to reduce the brittleness which results from hardening the steel. Materials are used for drill bits, such as tungsten carbide. However, this material is much more brittle than steel and for this reason additional coatings may be used

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