AccuWheel ACHR108-7810 Wheel Hub Centric Rings (108.00mm OD to 78.10mm ID) - Pack of 4 pcs Hub Ring Inner Diameter (Vehicle Hub Size): 78.10mm ID Hub Ring Outer Diameter (Wheel Bore Size): 108.00mm OD Made out of High Quality Poly Carbon Plastic. They will not corrode or melt in a regular condition Designed to Eliminate Vibrations caused by Custom Wheels not centering correctly onto vehicle's hub Please see Product Description section below for more Vehicle Compatibility