Fits most 20", 22-1/2" and 24-1/2" wheels with 11-1/4" bolt circle/center applications. Removable hub cap for easy inspection of axle. Made from plastic that is high-impact, light-weight, and corrosion resistant. Each set includes 1 cover, 1 cap, and 10 nut covers. Replacement parts: black 33mm spike thread-on nut cover (item # 10548B). **A minimum of 3 threads extending through the top of each nut is required for installation. Quantity: 2 Sets, a pair of axle covers.