Hub Centric Rings O.D. 73 I.D. 71.5 (Pack of 4) 73-71.5MM Hub Ring Inner Diameter (Vehicle Hub Size): 71.50mm Hub Ring Outer Diameter (Wheel Bore Size): 73.00mm 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