Niagara Cutter N69365 Cobalt Steel Square Nose End Mill, Inch, Weldon Shank, TiCN Finish, Roughing Cut, 36 Degree Helix, 3 Flutes, 3.875" Overall Length, 0.750" Cutting Diameter, 0.750" Shank Diameter Roughing end mills have chip-breaking cutting edges that remove material in less time than conventional end mills Coarse-pitch tooth design is suitable for machining soft, gummy materials 36-degree helix provides efficient cutting action and chip evacuation required to machine aluminum and nonferrous materials Titanium carbon nitride (TiCN) coating lubricates the end mill for high-temperature stability and offers greater abrasion resistance than uncoated tools Cobalt steel resists abrasion and high cutting temperatures, and has higher feed rates than high-speed steel