Tried to use it to break free a bolt that is only torqued down to 250 ft/lbs. The DeWalt couldn't didn't budge it. The battery is fully charged, I set the wrench on "3." I can't figure out why it didn't work. I got a smaller bolt out - as far as I can tell the tool is in good working order. It doesn't appear to be a counterfeit, at least it looks like the picture on DeWalt's website. It's heavy, and came with a light oily residue on it which I took to indicate being new. The box was unopened. Everything looks right, it just isn't doing the job I bought it for. I'm using it with a 10" impact extension, if that makes a difference. What could the problem be?