With this ring, you can use Kowa's adapter case and Vario smartphone adapter with Swarovski AR adapter rings. The ring is threaded into the Kowa shell for iPhone or Samsung, then the AR rings from Swarovski can be threaded into the shell.
These rings from Swarovski fit with Otterbox for:
AR adapter ring ATX/STX/ATC
AR adapter ring ATS/ATM/STS