YG-1 E5012 Carbide Square Nose End Mill, Long Reach, TIALN Multilayer Finish, 30 Deg Helix, 4 Flutes, 3" Overall Length, 0.25" Cutting Diameter, 0.25" Shank Diameter Suitable for general-purpose machining on steel, chromium-nickel steel, and malleable cast iron Four flutes produce a better finish than fewer flutes Long-length end mills have longer cutting edges and can make deeper cuts than standard-length end mills 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 uncoated finish, TiN coating, and TiCN coating Carbide can run at higher speeds than high-speed or cobalt steel, resisting wear and high cutting temperatures