These are Design for America (http://designforamerica.com/) keychain bottle openers.
I made this as a piece of DFA swag to distribute within our studio/at various events! Still a WIP, but it works pretty well as long as you don't try to go too fast when opening bottles. Note that different materials will perform differently as a bottle openers. I found that ABS ones tended to get chewed up easily by the metal caps. PLA worked okay. PETG worked okay for me, but I have had others report that they broke for them. Feedback on these is welcome!