Niagara Cutter N88604 Cobalt Steel Square Nose End Mill, Inch, Weldon Shank, TiCN Finish, Finishing Cut, 30 Degree Helix, 4 Flutes, 2.3125" Overall Length, 0.125" Cutting Diameter, 0.3750" Shank Diameter Number of flutes varies; fewer flutes have more chip-carrying capacity and more flutes produce a finer finish Titanium carbon nitride (TiCN) coating lubricates the end mill for high-temperature stability and offers better abrasion resistance than TiN coating Cobalt steel resists abrasion and high cutting temperatures, and has higher feed rates than high-speed steel Square nose end mills (also called square end) create sharp, unrounded cuts Center-cutting design allows the end mill to plunge into material like a drill bit while also performing conventional surface milling