So I have these aluminum wheel lugs I bought when my car was in ohio and after sitting there for a year the “key” was lost. It’s just a plain looking socket, fairly small, but it has 7-sides (at least I’m pretty sure they do, I need to go look closer when I get a chance)
I just tried to measure the lugs but they’re too deep to get a proper measurement.
I estimate them to be between 15mm and 17mm (my approx measurement was almost exactly 16mm)
I have Muteki ones and they are spline drive, not 7 sided. The Kyogugen or whatever ones are 7 sided. You need a special key for spline drive ones, but anyone with Muteki lugs will have the same key.