These milling cutters are made from tungsten vanadium steel and are purpose-made from a single blank. They feature precise flutes and optimal concentricity for a long life expectancy, making them ideal for free-hand precision work. Suitable for carving, shaping, and hollowing hard and soft woods, non-ferrous and precious metals, plastics, and plaster of Paris. Each pack contains 2 cutters with 2.35mm (3/32") shanks. Proxxon recommends using MICROMOT collets with these cutters.