Pictured is paracord ringbolt hitching that I tied over a 2.5" diameter steel ring.
The Ultimate Encyclopedia of Knots and Ropework by Geoffrey Budworth, has some good photos of tying different types of ring hitching: ringbolt, continuous, and alternate. Budworth's The Complete Book of Decorative Knots also has some good diagrams to follow.
JD of TyingItAllTogether has a YouTube video showing the same type of single strand ringbolt hitching.
There are other variations, like this example on the Marinews website, and another one here. And a tutorial for hitching on a walking staff. Ringbolt hitching is also called coxcombing or cockscombing, hog backing, and platted ring.
This is a ringbolt hitched paracord bracelet, made with about 10 feet of gutted paracord and a 3/8" side release buckle.
Before this one, I tied/untied three of them with the inner strands intact, different size buckle(5/8"), with gutted cord over another paracord bracelet, and with 4 and 8 strand cores to tie around. The hitching looked alright to me, but overall those seemed either too narrow and tall or oversized, so I went with a gutted paracord version.
The gutted cord is a bit difficult to keep from getting twisted and kinked but came out as an okay variation for a slim sized paracord bracelet. Maybe tied around a thin wide, metal or rubber wrist band might also work... YMMV