I only recently, before the house fire, acquired more than a couple of those 1/4 hex impact drivers used, thrift stores, Marketpharce. I was AMAZED that at least a couple of them will develop something on the order of 50 ft lbs!!! I don't know why the hex does not break!!! I tried it on the diesel. You can rattle the lug nuts on tight enough that I would not be afraid to drive it a short distance.