I wrote a post a few weeks ago, about getting a cordless impact wrench for my vehicles, as a back injury overseas, has made things difficult for me. I wound up with the dewalt 12v, 1/2 inch unit. I have had very positive results. The formerly useless rusted on lugs are finally free. I heavily sprayed once again some wrench brand penetrating fluid. I waited about ten minutes, and banged each lug a few times, and repeated the lubrication liquid again. I waited another five minutes and tried to free with a cross bar wrench, with a long section of pipe for leverage. No dice. I put a regular sized 21mm impact socket on the impact wrench and applie the trigger at first slowly. Nothing going on. I pressed the trigger down all the way, and applied a bit of forward pressure, and after about four or five seconds the lug zipped all the way out. Okay I said, lets see what happens. All the other lugs came out the same, with the exception of one lug. I changed to a deep socket and that did the trick. I cleaned off all the exposed metal, and using the wrench, gave a light tightening for a half second, and tighented to specs using a manual torque wrench. I am glad I got the wrench. I went to rotate the tires on my xterra(which I could do with a regular lug wrench), but using the impact, saved me a lot of wear and tear and time on my back, and was a joy to use. Net effect, I made a good decision and the tool, proved to get the job done. I leave the wrench in the trunk of the car, and will change the battery out every month.
Much regards