Unsure if it's original lug nuts or these are som kind of trash but this just happened when trying to remove one, it's still good like it's not rounded or whatever but it went from 19mm to 18mm socket size which I don't have and they are hard to come by where I live. Any solutions???

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Don't know where you live, but you can buy them online, auto parts stores, etc. I recommend gorilla.

 

Harbour freight has a rounded lug nut remover tool. Swap all nuts with McGuard or other solid chrome nut before it drives you…nuts.