YG-1 E2020 Cobalt Steel Ball Nose End Mill, Weldon Shank, Uncoated (Bright) Finish, Non-Center Cutting, 30 Deg Helix, 4 Flutes, 3.25" Overall Length, 0.5" Cutting Diameter, 0.5" Shank Diameter

Suitable for machining radius bottom slots, fillets, and special contours on a range of materials | Four flutes produce a better finish than fewer flutes | Cobalt steel resists abrasion and high cutting temperatures, and has higher feed rates than high-speed steel | Uncoated (bright) tools have no additional surface treatment or coating for use on a broad range of materials | Ball nose end mills (also called ball end) create contoured surfaces