Hubcentric Rings (Pack of 4) - 100mm ID to 108mm OD - Black Poly Carbon Plastic Hubrings Hub - Only Works on 100mm Vehicle Hubs & (108mm Wheel Centerbore [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] 100mm (Vehicle Hub needs be this Size) [HUB RING OUTER DIAMETER] 108mm (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.