We manufacture original chain fasteners.
I will explain one of them.
One is rod-shaped, and the other uses a part with two holes.
Thread it through one hole and then through the other.
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Unlike general metal fittings, it does not use springs, so it is less likely to break down and can be put on and taken off very easily.
The clasp itself looks good, so even if you bring it forward with the top of the necklace, it will have two points and create a good atmosphere.
Please try it if you have a chance.