Arrived in great packaging. I think this is a big improvement in looks over the standard Tesla wheel bosses for my model 3. I haven't read the fine print, but it's pretty clear that the spline adapter supports a double size allen wrench. I mistakenly assumed they were metric and imperial sizes. But unfortunately no. It is, and I quote, "double hex (3/4" and 13/16") for use with standard wheel tools." So don't use a 21mm socket! I checked: the aero cap still goes well with these established types. But my airbags were back in storage and I took them off the same day I got my car. I torqued them to 129 ft-lbs, drove around and rechecked their torque and all was fine. I noticed a similar set of these grommets at my local auto parts store for almost triple the price of these nuts. I generally prefer them to Tesla's plastic nut caps.