Big Bolt and Nut accessory M30

This is just a screw. M30 bolt and nut.
I designed the dimensions as close to the real thing as possible.

What is characteristic is that I add a small hole which passes a string and a small washer that is same size as bolt and nut. It is cute.

I would like washers to be made in various colors.
I want you to play by spinning around and hanging.

https://www.youtube.com/watch?v=uYZhutmMiAo