You measure the pasta using the hole, the numbers are for how many (average!) people the pasta is for.
115g per person is considered a normal portion.
OnShape Link:
https://cad.onshape.com/documents/e4449bb69b096b1dcccc0199/w/6a21aaee3000210320fd5db7/e/d232de61aee4ee025ec08799?renderMode=0&uiState=65ad2d547a58d029170f1355
The author marked this model as their own original creation.