These steel round rings are finished in polished stainless steel, marine grade A4-AISI 316. They are also referred to as O rings 

These stainless round O rings are available in a range of sizes, 5mm diameter bar, with different internal widths I.D.  (internal diameter) 25mm and 50mm, the smooth shiny finish is perfect for a change of direction or to enbellish a tie, great against the skin and will lift a knot whilst the chuncky 5mm profile stops the lay of the rope opening and crippling under tension.

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