Click & Lock 4mm, 5mm, 5.5mm, 7mm Jump Rings 925 Sterling Silver. Packs Of 10
There are all kinds of use for open jump rings and click/lock are the best because they enable you to secure the rings without the mess or hassle of soldering.
They are 0.64mm gauge (22ga).
If you haven't used these type of rings before, they click shut simply by manipulating them back and forth. Search YouTube for various instructional videos!