This is the heavy-duty version that others resell as their brand and charge more, in Phosphate finish
Sort of tongue in cheek, but Grovtec makes much of the sling hardware for many, many brands out there. At least the good ones. This one is for slings up to 1-1/4" and this has the steel phosphate finish and the recessed push-button.
This is for ONE push-button QD sling swivel. Grovetec also sells a two-pack as their GTSW287. This product comes in military grade plastic packaging.
Maybe you know the Grovtec name, or maybe you don't. What we at Charlie's like about Grovtec products, is they are simple and engineered to solve a problem. Many manufacturers start with marketing and design a product around buzz. Grovtec looks for simple answers to basic problems, and solves them. Grovtec products are made in the USA.
Manufacturer's Part Number: GTSW105 / GTSW287 (partial)