Oh, inside the timing case! Thought you meant outside. Yes, 6 mm. Make sure you have a high-quality hex tool, these bolts are tight and you don't want to break your tool or strip the head. Also, stuff some rags into the chain case and have a magnet handy. The screw heads have a washer that you don't want to drop.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970