Torx or RIBE socket. It is a special Polydrive type socket with 6 splines. This is the special tool number T40080. This is a car 1/2" drive M10 Polydrive socket for the camshaft adjuster locking bolt.
For Mercedes Benz M270/ M274/M276/M278 Camshaft Adjuster Engine Timing Tool Kit
Engine Alignment Locking Timing Tool Kit | Camshaft Adjuster for Mercedes Benz ⊥
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