Poor quality control. One of the nuts on the back wasn't even threaded, and the inside diameter is too big to thread it yourself. I emailed Circuit Performance and got an automated response that they will get back to me usually within 1-2 hours. Three days passed without an answer. I would just return them but the bad nut was on the last wheel I installed. Too much pain to remove all the beadlock screws. You only have to buy a nut