For those of you wondering, the thread on this is an exact match for 1/2" black pipe. I made my own light fixture from black pipe and a pot rack with lighting and these were a very strong and secure way to mount them over the electric box.
The price is crazy high for what it is, I would rather see it made out of cheaper steel than aluminum for my application. And it is power coated to order, though I didn't really need that either. But it is the only thing I could find anywhere that solved my problem.
The owner was very responsive and helpful in answering my questions.