Wheel Center CapsThis are made to order with your logo or design engraved in. Price is for a set of Four 4 center caps in Raw finish. Ranging from 50mm (2") to 78mm (3. 1") Outside Diameter and up to 0. 500" deep. Made from 6061 Aluminum Our Caps are O ring retained, we also can drill and tap if you would like to use set screws instead ** PLEASE Fill out the measuring form that is pictured OR you can send in your center cap to insure fitment ** We will need correct