Mini Bubble Spirit Level keychain

I got this little spirit level (15 x 15 x 40 mm) as a promotional gift and it was just lying around, so I turned it into a keychain.

I had to make the internal dimensions a little larger at 15.4 x 40.4 mm so the spirit level would fit perfectly.

Update 08.11.2023: It's bad that you can't see the spirit level from the side, so I added holes on the sides.
Update 17.12.2023: request from ferraguar. i hope it works.
Update 08.02.2026: Key ring broke for the first time. Redesigned to make the top part rounder.