Our Swarovski harness adapter is machined to fit perfectly on the mounting pin of the EL, ELR and NL series binoculars. Made from stainless and designed to replace the stock plastic hub. Now you can mount the harness split ring directly to the RYO hub without any damage caused by frequent use. The real advantage of this is you eliminate the need for additional straps which add uncontrolable whip. The more strap you eliminate between the binoculars and your harness the tighter the binoculars will ride.