The Wera 6004 Joker L is a universal, self-setting adjustable spanner designed for a wide range of applications. It automatically adjusts to different metric and imperial screw sizes, eliminating the need for multiple spanner dimensions. The continuous and parallel jaws securely grip hexagon bolts and screws, preventing damage and ensuring a high working speed. An integrated lever mechanism provides a secure hold, while the ratchet function allows for fast and consistent action without removing the tool. This spanner is ideal for users seeking a single, efficient tool for various fastening tasks.