Selected tungsten vanadium steel. Purposely made of stable construction with head and shaft out of a single blank. The precise flutes and optimal concentricity ensure best life expectancy. For use on hard and soft woods, NF and precious metals, as well as plastics and plaster of paris. Ideal for milling, routing, shaping, profiling and slotting. All shanks Ø 3/32" (2.35mm).