Vintage-style Hardware Adapter ring to increase the diameter of the base of a doorknob from 5/8\” to 23/32\” (just below 3/4\”), or to reduce the diameter of the doorknob ring from 3/4\” to 5/8\” Made of solid brass Product Description Specs A solid brass adapter ring to increase the diameter of the base of a doorknob from 5/8\” to 23/32\” (just below 3/4\”), or to reduce the diameter of the door knob ring from 3/4\” to 5/8\”. This ring fits at the base of doorknobs & is used for installing them in wider door roses. Outer diameter: 23/32\”, Inner diameter: 5/8\” Hardwick & Sons is pleased to offer vintage-style hardware for the many people who desire to fashion their homes with charm, quality, & style. The traditional-style hardware that we showcase are true & faithful reproductions of classic hardware pieces found in the many homes from across America throughout the past century. Product Model # Solid Brass Doorknob Adapter Ring BHM8660X WARNING: Cancer & Reproductive Harm – www.P65Warnings.ca.gov WARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use a dust mask or other safeguards for personal protection. For more information go to www.P65Warnings.ca.gov/wood