But the stock lug nuts are soft metal with a chrome cap pressed on-top. I find that they are easily damaged. You might consider replacing them with solid stainless steel lug nuts. Size is 1/2" x 20tpi ID acorn 3/4" OD with 60° conical seat.
^this is the Truth. It was more like 3-4 years for mine, but it begins w/ the lockable one which requires the keyed socket rusting heavily and I looked last night at them and they are toast after 4 years.