Proxxon Tungsten Vanadium Milling bits - No 28710 Selected tungsten vanadium steel. Purpose made of stable construction with head and shaft out of a single blank. The precise flutes and optimal concentricity ensure best life expectancy. All shafts 2.35 or 3.0mm. 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. Proxxon No 28710 size 3.1mm, 2.3mm, 2.3mm, 2.3mm, 2.3mm pack of 5