Many users desire a universal screw tool with as wide a range of applications as possible. It should be a single tool for multiple metric and imperial dimensions. It should automatically adjust to different screw sizes, grip securely, cause no damage, and allow for high working speed. The continuously adjustable and parallel-guided jaws replace several 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 ensures quick and continuous screwing without having to lift the tool. By using corner width prisms, a return swing angle of only 30° can be achieved. The single-arm design combined with the ratchet function and corner width prism allows for work in tight spaces. The adjustable Joker 6004 is the universal screw tool: self-adjusting, gripping, and ratcheting. It comes as a four-piece set for at least 18 different metric and imperial screw drives in a compact folding pouch. The pouch is equipped with a Velcro system on the back for attachment to walls, shelves, workshop carts, and the Wera 2go system.