Niagara Cutter N74984 Cobalt Steel Square Nose End Mill, Inch, Weldon Shank, TiAlN Finish, Roughing Cut, 36 Degree Helix, 3 Flutes, 3.063" Overall Length, 0.250" Cutting Diameter, 0.375" Shank Diameter 3 Flute design makes these perfect for finishing work Cobalt roughing end mill for working on aluminum and non-ferrous materials Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys Titanium Aluminum Nitride (TiAlN) combines high thermal stability with excellent hardness for abrasion resistance and a low coefficient of friction, for lubricity Center Cutting End Mills are designed with "End Teeth" making these ideal for applications such as profiling and slotting