This device is installed between the vehicle s hub and the wheel.The hub ring fills in the gap between the vehicle hub and the center bore of the wheel.Ensures a precise fit between your wheel and the hub.Designed to eliminate unwanted steering wheel vibrations.Precision machined to stop vibrations and ensure a snug fit every time.How to chose the hub ring?Hub rings are sized by using two different numbers that are measured in millimeters.The smaller of the 2 measurements such as 72.56mm is the inner diameter. This should match your vehicle s hub bore.The larger of the 2 measurements such as 74.1mm is the outer diameter. This should match your wheel s center bore.Notes:The outside diameter of the spigot ring should fit the wheel s center bore in the back of the wheel.The inside diameter is the size of the wheel hub on the vehicle you intend to fit the wheels too.Specification:Material: PlasticInner Diameter: (Vehicle Hub Size)72.56mm/2.86 Outer Diameter: (Wheel Bore Size) 74.1mm/2.92 Thickness: 10mm/0.39 Size: 10x74.1mm/0.39 x2.92 (T*D)Color: BlackPackage Includes:4 x Hub Centric Rings