This is a new Matra 1/2" drive M10 Polydrive socket for the camshaft adjuster locking bolt. This is not a Torx or RIBE socket. It is a special Polydrive type socket with 6 splines. Matra is a large company based in Germany that supplies special tools to VW and Audi. This is the Matra tool number T40080. It is about 50mm in length. Please check your service manual for this factory tool number. A fine quality German Made tool, that will let you do the job right.
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