This measuring ring can be used to measure legality of your barebow. Its designed with an 12.2cm inside diameter but results may vary between printers.
As stated in “BOOK 3 - TARGET ARCHERY” of the FITA Rulesbooks paragraph 11.4.1.
The unbraced bow complete with permitted accessories shall be capable of passing through a hole or ring with a 12.2cm inside diameter +/-0.5mm.
Waiver: This tool can be used but the judge of the competition has the final decision on the legality of your equipment.
The author marked this model as their own original creation.