After lots of turns and looking at the end, I decided on this square metal filter holder and adapter rings. They are better than I expected and I was surprised by several things:
1. The shipping speed and the seller's response (Excellent)
2. The presentation and protection of the product. In padded envelopes, properly packed to avoid damage.
3. The quality of having it in my hands. They look very durable and fulfill their function perfectly.

I definitely recommend your purchase.
Excellent!!! Excellent!!! Excellent!!! Excellent!!!