The file 'Fast Articulated Robot For Keyring / Earring 3D Printer Model' is (stl) file type, size is 27.1KB.
Based on the work done by NirDobovizki, all credit to them (https://www.thingiverse.com/thing:1706470)
I added a simple protruding tube so you can connect to a set of Earrings or an existing Keychain.
keyring.stl | 119.0KB |