The bolts that holds the hitch to the frame?
What I can tell you right off the top of my head is that they require an 18mm wrench to remove. The exact metric diameter/length/pitch, I'm not sure but can probably find out.
The diameter/ pitch/ length is what I can't find a definite answer on,found two different answers.
2011 JKU 3.5 R.E. Longarm lift.
Okay, I believe it's a 10mm x 1.50 pitch and is about 4-3/8" long.