<https://www.reddiseals.com/product/beaded-internal-door-knob/#product>
<http://schema.org/description>
"Solid brass internal door knob\r\n \tDoor knobs are unsprung\r\n \tSold in pairs\r\n \tRecommended for use with 3” latches to clear the door frame\r\n \tDoor knob plate size: 65mm Diameter\r\n\r\nMore Information"
<https://www.reddiseals.com/product/beaded-internal-door-knob/>