Very strong and well built, I fitted them to my 2011 g37s coupe about 1000 miles ago and had no problems. They were easy to install and the nuts that came with the spacers fit the OEM studs. So if you have OEM nuts that don't fit between the wheel and spacer, don't worry, you can still use the OEM nuts. to hold the wheel to the spacer and lug nuts to hold the spacer to the hub. In general, everything went well, the purchase is satisfied