YG-1 E2039 Cobalt Steel Square Nose End Mill, Weldon Shank, Uncoated (Bright) Finish, 30 Deg Helix, 4 Flutes, 2.5" Overall Length, 0.375" Cutting Diameter, 0.375" Shank Diameter Center-cutting design allows the end mill to plunge into material like a drill bit for applications such as slotting, drilling, and profiling 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 range of materials Square nose end mills (also called square end) create sharp, unrounded cuts