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Product Description Tungsten Vanadium Micro Twist Drills. Manufactured from one-piece blanks in tungsten vanadium steel for highest concentricity, providing breakage safety and long lifetime. For drilling metal, non-ferrous metals, plastic and wood. All shanks Ø 2.35mm (3/32"). From the Manufacturer Proxxon 28858 Tungsten vanadium micro twist-drills are manufactured from one piece blanks in tungsten vanadium steel for highest concentricity. Tunsten vanadium provides safety from breakage and allows for a longer bit lifetime. These bits are designed for drilling metal, non-ferrous metals, plastic and wood. Recommended work speeds: soft materials approximately 8,000 rpm and hard materials approximately 3,000 rpm.