Melin Tool ERP Cobalt Steel Square Nose End Mill, Uncoated (Bright) Finish, Roughing Cut, 35 Deg Helix, 3 Flutes, 2.5000" Overall Length, 0.3750" Cutting Diameter, 0.3750" Shank Diameter Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys Uncoated tools feature just the base substrate without any additional treatment or coatings and are suitable for a wide range of applications Weldon shanks feature a round shank with one of more flats machined into the side for easy indexing and alignment A rough finish is produced which will require a finishing pass Designed to machine soft materials such as aluminum, plastic, zinc alloys