Proxxon HSS Cutter – 6mm Diameter (Pkt 2). Milling cutters are made from tungsten vanadium steel. They are purpose-made out of a single blank. The precise flutes and optimal concentricity ensure the longest life expectancy. They are ideal for free-hand precision work. For carving, shaping and hollowing of hard and soft woods, non-ferrous and precious metals as well as plastics and plaster of Paris. 2.35mm(3/32″) shanks. We recommend the use of MICROMOT collets with these cutters.