Lug Nut Sizes
 

I have seen numerous inquiries about what is the size of the lug nuts. After many hours of investigation here is what I have found. For the 2021 RX 350 F Sport model, the lug nuts were 13/16" (American), however the McGARD wheel locks (all of which came with the car's new purchase) was 21mm (which is slightly larger than 13/16"). The tire iron that came with the car is also 21mm. Therefore the tire iron is not the correct size for the lug nuts. It probably will remove the lug nuts, but you could strip the nuts as well over time. I am unsure on any other RX350 sizes, but guess it might be similar. Oh by the way, if you ask the dealer about this, they will probably deny there is any issue.