{
  "purpose": "Illustrative dimensions, not a ring-size chart",
  "unit": "mm",
  "original": {
    "internalDiameter": 18,
    "externalDiameter": 22,
    "wall": 2,
    "width": 2,
    "illustrativeSeat": 6
  },
  "scale": 1.0555555555555556,
  "uniform": {
    "internalDiameter": 19,
    "externalDiameter": 23.22222222222222,
    "wall": 2.111111111111111,
    "width": 2.111111111111111,
    "illustrativeSeat": 6.333333333333333
  },
  "controlled": {
    "internalDiameter": 19,
    "externalDiameter": 23,
    "wall": 2,
    "width": 2,
    "illustrativeSeat": 6
  }
}