Keychain holder for Titaner Triroler (https://www.titaner.com/collections/new-everyday-carry-1/products/tiroler-exquisite-titanium-curve-measure-ring-on-fingertips) fidget toy/measuring tool.  This will fit the 10 cm version only.  The Titaner comes with a cheap lanyard, and I wanted something a little more practical that I could access easily from my keychain.