Niagara Cutter N55620 Carbide Ball Nose End Mill, Inch, TiAlN Finish, Roughing and Finishing Cut, 30 Degree Helix, 2 Flutes, 3" Overall Length, 0.125" Cutting Diameter, 0.125" Shank Diameter Two flutes offer better chip-carrying capacity than end mills with more flutes, enhancing the tools ability to remove material Titanium aluminum nitride (TiAlN) coating lubricates the end mill for high-temperature stability and abrasion resistance, offering better heat resistance than TiN and TiCN coatings Carbide can run at higher speeds than high-speed steel, resisting abrasion and high cutting temperatures Ball nose end mills (also called ball end) create contoured surfaces Center-cutting design allows the end mill to plunge into material like a drill bit while also performing conventional surface milling