German Polygon Wrench with ratchet mechanism from Unior with size 13mm. Each German polygon wrench combines 2 tools, the German key for tightening bolts and the polygon suitable for tightening screws. It offers great flexibility as it combines the advantages of 2 different keys. Also, it has a breakable polygon head for use at any angle. It is suitable for tightening screws and bolts 13mm in tight workspaces thanks to the ratchet mechanism it has.