u/Visual-Bonus-4058

I’ve got an 04 vue with the 3.5 L. I’ve tried literally every socket I own. I’ve read multiple manuals, and I cannot figure out what the size of the bolt is. It’s not seized on there. It’s not rusted. It’s not stripped. It’s not anything it’s perfectly intact bolt I just can’t figure out what the size is so please any help would be appreciated!!!!

EDIT: Thanks for all the helpful comments, I unfortunately couldn’t find a proper fitting socket or wrench, so I just used the one that fit the most snug on the bolt. My Vue lives another day!