Flat keyholder for safedoor

I keep the key to my gunsafe in a small hotel-safe (so the kids can't take it). After moving the hotel-safe to a high location, I wanted a easy way to grab the gun-key so I made this to hang it on the inside of the door.

It's dead simple, but it does the job for me :) Source at https://www.tinkercad.com/things/buIIeCREObt-mini-safe-key-hanger