The MICRO 100 MEF-040-500-010K miniature, nACRo - Aluminum Chromium Silicon Nitride, solid carbide, 2 flute, center cutting, hard milling end mill with a corner radius. Extra fine carbide end mills designed and engineered for hard milling applications. Capable of machining hardened materials 45-68 Rc. End mills can be utilized for both roughing and finishing. This line of end mills features 1.5x to 12x reach lengths. Manufactured with close tolerances to ensure ultimate precision and performance. nACRo coatings are extremely heat and scratch resistant. This coating provides exceptional performance for those "tough and difficult" materials where temperatures increase dramatically during the machining application. Applicable with oxidation temperatures up to 1100? C or 2102? F. AlTiN coatings are best suited for aluminum alloys, steels, carbon steels, stainless steels, hardened steels, nickel alloys, cast irons, and most high temperature alloys. MICRO 100 Solid Carbide Tools feature more than just a micro-grain of excellent quality. Their substrate is in class of its own resulting from exclusive treating processes that allow increased speed and feed rates. For over 45 years, MICRO 100 is a known industry leader and internationally acclaimed when it comes to solid carbide tooling.