Self-adjusting double open-end wrench for hexagonal screw heads or nuts with sizes of 10.0; 11.0; 12.0; 13.0 and 16.0; 17.0; 18.0; 19.0 (metric) as well as 7/16"; 1/2" and 5/8"; 11/16"; 3/4" (imperial). The continuously adjustable and parallel-guided jaws replace multiple individual sizes of open-end wrenches. The required size automatically adjusts when applied to the hex nut or screw. The integrated lever mechanism securely clamps the hex screw or nut between the jaws, significantly reducing the risk of slipping and damage. The ratchet function allows for quick and continuous screwing without repositioning. By utilizing the corner width prisms, a return angle of only 30° can be achieved. The ratchet function and corner width prism enable work even in tight spaces. The adjustable double open-end wrench Joker 6006 with ratchet function is the universal tool for screwing. Self-adjusting. Gripping. Ratcheting.