What is this Hinge Called

I need to source this hinge and am coming up blank on what to call it. The tubing is approx. 3/4" OD and the tubing end of the hinge goes inside the tube. I am not certain on how it couples together. https://preview.redd.it/jub0502zdlde1.jpg?width=1512&format=pjpg&auto=webp&s=6e14a3463dec592f919eaba5672e060a4ca63641