Stable, made of metal, very easy to assemble and disassemble. Unfortunately, the ring is too small for the digital microscope I bought (Koolertron, ASIN: B016ICHOQ6), which was also not a high-quality microscope. The bag is not as advertised (see photos) but that is not the reason I am returning this item. If the diameter of the ring was a bit larger I would keep this holder.
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