ITEM NAME:4Pcs/Set Chrome Wheels Hub Centric Rings Aluminium Alloy OD=67.1mm to ID=54.1mm 4PCS Chrome Aluminum Wheel Hub Centric Rings Spigot Spacer Set 54.1mm ID to 67.1mm OD SPECIFICATIONS.The centric ring is a device used with the rims and are installed between the car wheel hub and the rim. The purpose of the hub centric ring is to fill the empty space between the wheel hub and the center bore of the rim.