I am trying to install a trailer hitch on my 2011 Toyota Camry. I have to lower the exhaust. All bolts (14mm or 9/16") are removed except the one with a special hex nut (not sure is a hex or not but looks like).
I call it a special hex nut because all tool heads I have cannot fit that nut. And from the picture you can see it is not a regular hex nut because it seems it doesn't have equal sides.
My question is where I can find a proper tool to hold that nut and then I can screw it out?