Lug nuts on our soccer mom van those chromed metal sleeve over a nut that by the time you beat it heat it has no socket size except roughly round,Snapon does not sell a round impact socket.I have replaced all of them with solids but not before having to drill the studs out here and there and when torqued to spec when fall comes and time for winter tire changeover it seems as though they have been welded on the stud and I use liberal amounts of anti seize every time against the manufacturers recommendation lots of kind words spoken. Cheers