Review on Gorilla Automotive 73-6006 Wheel Hub Centric Rings (73mm Outer Diameter x 60.06mm Inner Diameter) - Set of 4 by Mark Adlesh

Anyone who looks at them already knows what they are for. The outside diameter is typical of most aftermarket wheels, while the inside diameter will depend on your vehicle. I'm switching from aluminum rings. This will be the second car I've used plastic rings on and they work great. Aluminum rings are good, but some have fit issues that can't be fixed unless you have the tools to process them. Also, galvanic corrosion becomes a problem when they are bonded to a steel surface (e.g. brake drums).