Bottle Opener Knuck Keychain Tool
Check out the YouTube Review! This Thing actually works! https://youtu.be/VH7kLPBMtF8
Four models with alternating sides and ring holes. Two of them have thicker walls for increased impact strength and varying levels of comfort.
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/1vZiuEMiYlP