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I bought these units to mount a couple of flashes off-camera for macro photography. They are each holding a flash unit weighing about 500g. They are up to the task and are working well. I suspect that 500g is about the limit of their load-bearing capacity at the 90-degree position.
We received our order quicker than expected given Covid interstate restrictions etc and was very happy with the products in every respect. They were excellent quality, exactly to specifications published and the whole experience exceeded our expectations.