AccuWheel ACHR87-7800 Wheel Hub Centric Rings (87.20mm OD to 78.00mm ID) - Pack of 4 pcs Hub Ring Inner Diameter (Vehicle Hub Size): 78.00mm Hub Ring Outer Diameter (Wheel Bore Size): 87.20mm 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