Wiha special chrome-vanadium-molybdenum tool steel. Through hardened for best wear resistance. Corrosion protective Hard Chrome Finish. Exact Fit Precision Machined Tips. Precision Handle is made of high Quality cadmium free Plastic. Molded on handle for permanent bond to blade. The Tapered Shape allows rapid rotation. Handles Proportioned to Blade Size for optimum torque. Precision Turning and Control with the Rotating Top Cap.