I bought these rings and used them once for a few kms. They will get you from the 57.1mm hub (used on Audi’s but on other cars as well) to 66.6mm that I needed for aftermarket rims. I have a set in aluminum and a set in plastic. I used the aluminum ones once for a few hours. The plastic ones were given to me so I don’t know if they are used or not; I didn’t use them. Aluminum – 20.00 Plastic - free