This isn’t a rope knurled hook tender. It is actually sterling silver wire that has been twisted like a rope, so the pattern spins around the entire loop. Each ring is hand-soldered in our shop and comes with a short strap, just like our standard nickel silver Ring & Saddle hook tenders.
One size fits all, about 3mm I.D.
Be sure to check out the Traditional Ring & Saddle Hook Tender page for some good info and pics on creating a proper saddle from the supplied piece of Nickel Silver strap material.