We're suckers for a good keychain and this simple little piece from Buttonworks in Japan hits all the checkboxes for us. Firstly, it's dead simple and secondly, it just looks pretty damn cool.
What makes it "revolving" is the set of discs that let you push the keys through to get it on the key ring. Based off a design from the 1800s, the revolving keyring works by simply placing the holes in your key into the notch and aligning the discs to then push the keys through. Both discs must be aligned, so your keys will be safe and secure.