These are four hub-centric spigot rings from WheelPartsDirect, designed to reduce your hub bore from 72.6mm down to 66.6mm. They’re perfect if you’re fitting aftermarket wheels with a larger center bore onto your Mercedes E-Class, specifically the W213 model from around 2016. They help keep your wheels perfectly centered, reducing vibration and giving you a smoother ride. The part number is 72.6-66.6. They’re brand new and ready to pop in during your next wheel swap.