Niagara Cutter N75666 Cobalt Steel Square Nose End Mill, Weldon Shank, TiAlN Finish, Roughing Cutting, Non-Center, 30-Degree Helix, 4-Flute, 4" OAL, 0.500" Cut Diameter, 0.500" Shank Diameter Roughing end mills have chip-breaking cutting edges that remove material in less time than conventional end mills Fine-pitch tooth design is suitable for machining high-temperature alloys Titanium aluminum nitride (TiAlN) coating lubricates the end mill for high-temperature stability and abrasion resistance at high cutting speeds, offering better heat resistance than TiN and TiCN coatings Square end creates sharp, unrounded cuts and has a corner chamfer to strengthen the cutting edges Number of flutes varies by diameter for optimum feed and cut rate