Tire-mounted wheel step provides quick easy access to under-hood componentsFits heavy-duty vehicles Class 7/8300 pound capacity and installs in secondsAdjusts to fit 22-1/ 2 inch to 24 inch wheel sizesNon-skid platform surfaceOTC Heavy Duty Truck Wheel Step Tire-mounted wheel step provides quick, easy access to under-hood components. It fits heavy-duty vehicles (Class 7/8). 300 pound capacity and installs in seconds. Its adjusts to fit 22-1/ 2 inch to 24 inch wheel sizes. Its a non-skid platform surface. It comes with Lifetime Marathon Warranty.