Ensures a precise fit between your wheel and the hub. Hub Bore Centering Rings X AUTOHAUX 4-Pack Hub Centric Rings - 106mm To 77.8mm Wheel Bore Centering Rings The hub ring fills in the gap between the vehicle hub and the center bore of the wheel. This should match your vehicle's hub bore. This should match your wheel's center bore. The larger of the 2 measurements such as 106 is the outer diameter. Notes:The outside diameter of the spigot ring should fit the wheel's center bore in the back of the wheel. The smaller of the 2 measurements such as 77., 8 is the inner diameter. Precision machined to stop vibrations and ensure a snug fit every time. Buy 4pcs od 108mm aluminium alloy car hub centric rings wheel bore center spacer at , get more in various size Designed to correct minor wheel and hub dimensions. Fit for any vehicle with a 77.8mm hub that needs to adapt a wheel with a 106mm center bore (OD=106mm, ID=77.8mm Package Included:4 x Hub Centric Rings 84.10 Mm To 106 Mm Hub Adapters How to choose the hub ring?Hub rings are sized by using two different numbers that are measured in millimeters. Designed to correct minor wheel and hub dimensions.