During turning, the tool is guided in the two V-flutes over the cylindrical shank surface. This eliminates radial run-out errors due to clamping and results in high reproducibility in the measurement of the cutting edges and the corresponding envelope contour. The latter corresponds to the effective contour of the tool during use and is measured in reference to the shaft without alignment processes. For all tools with a cylindrical shaft, the Werth V Pro tool rotary device offers the perfect clamping technology.