Hubcentric Rings (Pack of 4) - 54.1mm ID to 73.1mm OD - Black Poly Carbon Plastic Hubrings Hub - Only Works on 54.1mm Vehicle Hubs & (73.1mm Wheel Centerbore (Pack of 4) [QUALITY] Authentic Precision European Motorwerk Hub Centric Rings made of corrosion resistant polycarbonate plastic [FITMENT] Buyer is responsible for ordering the correct size. It is necessary that you measure your vehicle's hub and your wheel's centerbore before purchasing. See the description section for additional information. [HUB RING INNER DIAMETER] 54.1mm (Vehicle Hub needs be this Size) [HUB RING OUTER DIAMETER] 73.1mm (Wheel Center Bore needs to be this Size) [BENEFITS] Eliminate vibrations caused by your wheels not centering correctly onto your vehicle's hub. Easy to Install.