Designed to Take Up the Gap Between the 26 mm Stud Hole and 22 mm Wheel Stud on Hub Piloted Commercial Wheels • Compatible With Aluminum and Steel. Made From High-Temp Polyamide With Standing Heat of 450° Fahrenheit Plus • 1000 Piece Pail • 11R22.5, 24.5, RV, Bus, Some 19.5 Applications • Increase Fuel Mileage, Tire Life, Stop Wheel End Vibration, Stop Irregular Tire Wear, Decrease Maintenance, Reduce Tire Cupping • Re-Aligns the Wheel to the True Center of the Hub Bearing