Niagara Cutter N42667 Cobalt Steel Square Nose End Mill, Weldon Shank, Uncoated Finish, Roughing and Finishing Cutting, 36-Degree, 3-Flute, 2.5" OAL, 0.375" Cut Diameter, 0.375" Shank Diameter Truncated rougher-finisher removes material in less time than conventional end mills while producing a finer finish than fine- or coarse-pitch roughers 36-degree helix provides efficient cutting action and chip evacuation required to machine aluminum and nonferrous materials Three flutes optimize feed and cut rate 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