Quick Rig’s own Solid Welded Stainless Steel Rings. Check out the welds as they are not butt welds that can break at the wrong time but overlaid and smooth for maximum strength. 
 
Available in the following sizes
 
#6 ( 300lb test - 10.3mm OD )
#8 ( 450lb test - 12.7mm OD )
 
Sold in packs of 5