Bought this kit for my 2004 Jeep TJ Rubicon when one of the OEM nuts fell apart after removing it. They use a standard iron nut with what appears to be a tin cap that comes loose. Gorilla Nuts are solid, chrome plated very well. It's also great to have a lock nut on each stud - and since they're all the same they look so much better than 4 OEM nuts and a lock nut. Delivery was great too. I live in Canada and they are out of stock on amazon.ca so I ordered them on amazon.com. They were on my doorstep in 8 days! Can't beat it Bought two more sets. One for my other car and one as a gift for my son for his. In my opinion a great product.