Sterling Silver 4mm x 3mm I.D. Oval Locking Ring, Pack of 10
These can be tricky the first time you open and lock your first ring. Be sure to put on your glasses or use a magnifier if you need one because the locking component is quite small. You'll need two chain nose pliers to open and lock these rings into place. Once you lock them they are a done deal, so no reopening these puppies!