I need to know if the idler pulley bolt is a hex or torx and what size? I can't seen to visually determine this. I fit a size 7 hex, seems to fit, but don't want to strip the head if it's a torx. I don't have a torx set with me to try.

I think it’s a 6mm hex if I remember correctly

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1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

Thanks. I was able to slide in a hex and a torx, and the both seem just as snug, but before I try and take it off I am going to have to find out for sure which one it is.