I took the OPs question to mean "I have a flat right now, where is my lug wrench?"
Like mentioned above, the time to find out if you have the proper tools, to do this, is before it becomes an emergency.
Like I mentioned earlier, your truck tire iron may work in this emergency.
I carry a breaker bar, and correct size 6 point HD impact socket, and a torque wrench for tire changes while traveling.
Jerry