Item arrived quickly and really did fit the size of the 10mm stainless steel jump rings. However, the material proved to be too flexible. that I could open/close them with just my fingers with some force. I could see this happen when the material was aluminum or a softer metal, but not with smaller diameter 1.2mm stainless steel jump rings. I ordered another pack of jump rings (10mm, 1.4mm thick) from the same manufacturer. Let's assume (Valyria) but from another Revain listing to compare this product to this one and found that another product's 1.4mm thickness was much stiffer/stronger than this product's 1.4mm thickness .2mm. My guess is that the extra 0.2mm thickness made a significant difference or the metals used were simply different. I will be using these because I see no point in sending them back when they were only $5 a pack, but I will not be ordering that particular pack of adapter rings in the future because I don't think they will hold up well what I use them - wallet chains / keyrings.
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