123 589 01 10 00 Allen wrench socket - WS46.00-P-0018A
WARNING: This page is about a different car, the 2012 Mercedes-Benz C300, 2011 Mercedes-Benz C300, 2010 Mercedes-Benz C300, 2009 Mercedes-Benz C300, and 2008 Mercedes-Benz C300. However, it is still accessible from the selected car via links, so may be relevant.
FG 46/Set A
MODEL 107, 123, 124, 126, 170, 201, 202, 240
Use/specification:
6 mm Allen wrench socket, 3/8" square drive for adjusting pressing tool (pitman arm shaft)