Most modern aftermarket rims are made with an oversize center bore and the centering ring brings that bore size down to the Miata/MX5 hub fitment of 54.1 mm. If you have an MX5, these help properly fit your new wheels.
This 72.6mm size fits many Enkei Tuner Series wheels.
Price is for set of FOUR rings, so you only need ONE order of these...please do NOT order FOUR SETS unless you really want four sets!!!