VW CV bolt tool. This tool is a must have for removing the bolts holding the inner CV joint on late modle VWs. Its an easy job with this tool, impossible without. The 10 mm is also used on some alternator pulleys, starter mounting bolts, flywheel bolts, and some 1.8T engine head bolts.
If you are buying this tool to remove your axle you will also need the axle nut tool shown below. If you find your CV joint bolts damaged or stripped this is a good time to replace them. The most common 10mm style bolt is shown below.