Wera 6006 Joker 2 Set 1 Self Setting Double Spanner Wrenches 050203400012 piece set. Self setting double spanners for hexagon screw heads and bolts with wrench sizes 7 10, 10 13 (metric) or 1 4" 3 8", 7 16" 8 16" (imperial) and 13 16, 16 19 (metric) or 1 2" 5 8" and 5 8" 3 4" (imperial). 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 securely