3/8 Dia., 3/8 Shank, 5/8 LOC, 6.0 OAL, 2.5 Length Below Shank,(2 Flute Pictured) Recommended for machining complex or irregular contours, finishing, and copy milling. AlTin coating provides excellent tool life when milling annealed and pre-hardened mold and tool steels. Best performance requires maximum heat at the cutting edge to oxidize the aluminum in the coating. Run dry when possible.