These end mills are designed to machine most materials, however, because of their small size, feeds and speeds are very material specific. Care must be taken not to over feed as breakage may result. These tools offer a very short length of cut so that unnecessary extension, which often causes deflection and breakage, can be avoided. These end mills are designed to cut difficult and abrasive materials, ranging from medium to the highest hardness levels machinable by Carbide End Mills.