Niagara Cutter N10378 High Speed Steel Square Nose End Mill, Weldon Shank, TiAlN Finish, Roughing and Finishing Cutting, 30-Degree, 4-Flute, 2.875" OAL, 0.375" Cut Diameter, 0.375" Shank Diameter Number of flutes varies; fewer flutes have more chip-carrying capacity and more flutes produce a finer finish 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 High-speed steel is compatible with a variety of materials Square nose end mills (also called square end) create sharp, unrounded cuts Center-cutting design allows the end mill to plunge into material like a drill bit while also performing conventional surface milling