Niagara Cutter N85030 High Speed Steel Square Nose End Mill, Weldon Shank, Uncoated, Roughing/Finishing Cutting, Non-Center, 30-Degree, 4-Flute, 2.3125" OAL, 3 mm Cut Diameter, 0.375" Shank Diameter Four flutes produce a better finish than fewer flutes High-speed steel is compatible with a variety of materials Uncoated (bright) tools have no additional surface treatment or coating for use on a broad range of materials Square nose end mills (also called square end) create sharp, unrounded cuts Center-cutting design allows the end mill to plunge into material like a drill bit while also performing conventional surface milling