simple to print model, no supports, I made lettering raised for a quick color change, print all 3 on one plate to optimize color change

if anyone would like smaller or larger sizes reach out and I can make and add these.

Here are the most common U.S. standard ring sizes with their corresponding inner diameters in millimeters, including half sizes, for sizes 3- 20:

• US Size	Diameter (mm)
  3	14.1
  3.5	14.5
  4	14.8
  4.5	15.2
  5	15.6
  5.5	16.1
  6	16.5
  6.5	16.9
  7	17.3
  7.5	17.7
  8	18.1
  8.5	18.5
  9	18.9
  9.5	19.4
  10	19.8
  10.5	20.2
  11	20.6
  11.5	21.0
  12	21.4
  12.5	21.8
  13	22.2
  13.5	22.6
  14	23.0
  14.5	23.4
  15	23.8
  15.5	24.2
  16	24.6
  16.5	25.0
  17	25.4
  17.5	25.8
  18	26.2
  18.5	26.6
  19	27.0
  19.5	27.4
  20	27.8