These "knockoff" hub covers are designed to mount on the flat face of "mag" or "Halibrand" style wheels. They are held on by the same long-shank lug nuts that hold the wheel on. The lug nuts are concealed behind the cover which is held on by the knockoff.
Most current wheels don't use the long shank lugs. To mount these on wheels not using the long-shank mag nuts, you will have to drill and tap holes on the face of the wheel and provide your own screws to mount the base plates.
Highly polished cast aluminum construction. Set of four.
5 lug, 4-1/2" and 4-3/4"