6004 Joker S self-setting spanner6004 Joker S self setting spanner Many users wish to have a universal screwdriving tool with the widest possible range of applications. It should be a single tool for multiple metric and imperial dimensions. It should automatically adjust to the different screw sizes. It should be safe to grab without damaging anything and allow for a high working speed. The continuous and parallel jaws replace several single spanner dimensions. The required size is