they can be used for most cutting work, enigmatic , boring, studs and carving, and suitable for materials like particle board, MDF board, hardwood and softwood, quite practical and deserving High quality material, this router bit set is made of high quality tungsten carbide with tungsten carbide tip, special material all heat-treated allows it to acquire high strength, high concentricity, cutting crisp, smooth rotation and quite easy and light to use, also durable enough to serve a long life 1 / 2-inch shank for a stable and precise cut, this alloy bit also includes a 1/2 inch shank that provides sealed bearings to help improve stability and precision when using Well kept in wooden box Convenient to use this cemented carbide bur also comes with high quality wooden case, size approx. All the bits have their own named position and will be well preserved, well sealed to prevent oxidation and extend the service life, besides, all the grids have been clearly named for easy use, also very convenient to carry