The Morimoto Shroud Centric Rings are essential accessories for seamlessly integrating common shrouds with 3" openings onto 2.5" projectors. Crafted for precision, these rings effortlessly snap into the circular flange on the shroud's backside and snugly fit over the front lens frame of projectors, ensuring a flawless installation. To enhance durability, it's recommended to apply epoxy or silicone between surfaces to prevent any potential loosening due to vibration. It's important to note that while these rings provide a secure fit for most shrouds, modifications may be required for compatibility with E46-R or Gatling Gun 2.0 shrouds.