Niagara Cutter N32062 High Speed Steel Ball Nose End Mill, Weldon Shank, TiAlN Finish, Roughing and Finishing Cutting, 37-Degree, 3-Flute, 3.25" OAL, 0.500" Cut Diameter, 0.500" Shank Diameter 3 Flute high-helix design makes these end mills ideal for finishing work High performance for working on aluminum High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance Titanium Aluminum Nitride (TiAlN) combines high thermal stability with excellent hardness for abrasion resistance and a low coefficient of friction, for lubricity Center Cutting End Mills are designed with "End Teeth" making these ideal for Slotting and Cavity applications