Short tee 90° connection between 2 tubes.
To suit 48.3mm tube
Typical use is on straight and level guardrail to connect the vertical post to the top rail or end/mid rail.
How to review a simple joint?! Well it does what you would expect for little cost. Very easy use, just make sure you have the correct hex key to hand. Good casting with no sharp edges.
The ability to slide the tee into place aided positioning and height of handrail.