Wera 7870 Joker S Self-Setting Spanner Torque Wrench Insert 05020175001Self setting insert spanner, for hexagon screw heads and bolts, for torque wrenches from the Click Torque X and XP series with 9x12 mm mounting. Covers all metric and imperial dimensions in the respective field of application. With its continuous and parallel jaws, the tool replaces several single spanner sizes. The required size is automatically and continuously set when attaching the tool to the hexagon bolt or screw. The integrated lever mechanism