This file contains 2 sizes of a ring: diameter of 16 and 17 mm. For a comfortable use, please, notice that the hight of a ring is 3.3 mm.
Please, while printing, do not forget to take into account the shortage of the metal after the casting. If needed, rescale the model on 1-5% to avoid shortages during casting or making molds. In case you need this model in other formats (3DS MAX) or you might need to do some changes to the model, please, do not hesitate to make a request, I will be glad to be of help.