Review on 🌀 Industrial Grade Air King 9320 20-Inch Ceiling Mount Fan - 1/6-HP, 3,670-CFM, Black Finish by Shawn Bass

I ordered these tugs last month and installed them in the garage. I connected both to the timer on the wall (so I don't forget and accidentally leave them on too long). I found it a bit odd that they came with a tubular look for ceiling mounts - I'm not sure how many people have 4" joists! I just attached mine to my ceiling joists using 2 of the 4 holes in the round flange with 5/16" x 3.5" screws and they seem solid. The first one I got was a slightly rusty threaded nipple and I had to buy a large pipe wrench to tighten it at the set screw locations. The second block had no corrosion (looked like a different material (shiny) and came off easily In both cases I had to use a tap to tap on the set screw holes before I could thread the set screws in. Does it appear that these brackets come pre assembled? what you do.