The large ring to open actually not at all. The key, etc. are supposed to the 3 small rings - 3 are the way to little ...
After I made the turn there, the rings were partially bent and my nails I have not really spared.
And the dark silver look sees the reality of more like that of a 10 kg steel ingots from the industry. In 1-store there are better quality!
"Patented world novelty" - or shopping channel item?