1.40 mm Cutter Diameter x 2.10 mm Length of Cut Carbide Ball End Mill For Exotic High Temp Alloys, 3 Flutes, AlTiN Nano Coated. Optimized for titanium alloys, inconel, nickel alloys, and other high-temperature materials with outstanding performance in difficult-to-machine steels, stainless steels, and tool steels, this ball profile offering of fully stocked Harvey Tool end mills features AlTiN Nano coating.