Swiss Tech America. They sell all sorts of European marine gear that you normally do not see in the U.S.
They import German WASI anchors and anchor swivels. The picture above shows the German Lloyd's test report for a WASI Powerball anchor swivel. The chain clearly broke before the swivel. This may be a good alternative to other swivel types that have been reported to fail in the west-coast sailing press.
It should be noted that the weak link may be the installer. The proper tightening of those allen screw pins is crucial to success.