The circular lips (above and below) are to push on with your finger so the 2 circular plates break up. This way, you can put the another pair op circular lips inbetween. Then, you can put a metal bar through te holes.
It is also possible to put 3 op them together.
It is made op stainless steel. Production technique: sheet metal folding.
Something to work on: can it be made strong enough?
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