I set out to solve a small annoyance I kept running into—when using a carabiner on my keys, it would often get stuck when I tried to clip it on or take it off. This design uses an open hook on the belt side that’s slightly angled, making it easy to quickly hook or remove without even having to look.

The hook originally had openings on both sides, but I noticed my keys could slip out if I held them upside down. To fix that, I added a small tooth that keeps the keys secure and makes removal a more intentional movement—while still letting you add keys quickly without dealing with those annoying key rings.

I experimented with a variety of sizes, thicknesses, and materials, and this version turned out to be the most versatile overall. I’d love to see what other uses people come up with for it and hear any ideas you might have for improving the design!