YG-1 E5023 Carbide Square Nose End Mill, Double End, TIALN Multilayer Finish, 30 Deg Helix, 4 Flutes, 3" Overall Length, 0.5" Cutting Diameter, 0.5" Shank Diameter Double-end square end mills create sharp, unrounded cuts and have cutting edges on both ends for longer tool life Suitable for general-purpose machining on steel, chromium-nickel steel, and malleable cast iron Stub length increases the strength of the tool, making it less likely to break in the workpiece Four flutes produce a better finish than fewer flutes 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