These are ultra heavy duty stainless steel jump rings in outside dimensions of 10mm, 11mm, 12mm, 13mm or 15mm.
These ultra heavy duty jump rings are extra thick and sturdy at 2mm thick (12 gauge).
***Please note this is THICK stainless steel. They do not open and close easily. They take some strength and the right tools. Personally I need heavy duty pliers to open and close them.
These are available only in the Closed style (unsoldered but in the closed position).