Melin Tool R Cobalt Steel Corner Rounding End Mill, Weldon Shank, Uncoated (Bright) Finish, Non-Center Cutting, 30 Deg Helix, 3 Flutes, 3.7500" Overall Length, 1.5000" Cutting Diameter, 1.5" 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 Designed to produce a radius between a horizontal and vertical surface Tools are formed-relieved which allows the form and size to be maintained after resharpening