Melin Tool CC-L Cobalt Steel Square Nose End Mill, Weldon Shank, Uncoated (Bright) Finish, 30 Deg Helix, 4 Flutes, 6.5000" Overall Length, 1.2500" Cutting Diameter, 1.25" 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 Used for general purpose milling in most materials of medium and tough alloy materials such as stainless steel, nickel base alloy, brass, iron, etc 30 Degree helix angle