The Wera 6004 Joker is a self-setting adjustable spanner, offering a universal solution for a wide range of applications. This single tool accommodates multiple metric and imperial dimensions, automatically adjusting to different screw sizes. Its continuous and parallel jaws replace several single spanner dimensions, ensuring a secure grip without causing damage and allowing for high working speeds. The required size is automatically set when attaching the tool to a hexagon bolt or screw. An integrated lever mechanism securely clamps the bolt or screw between the jaws, significantly reducing the risk of slippage or damage. The ratchet function ensures fast and consistent action without needing to remove the tool. The rectangular prisms at the corners provide a back-pivoting angle of only 30 degrees.