YThe pictures are of the nutserts.
What you're seeing is the backside, the part that will be inside the ceiling.
The front side is all but flush.
I ran a bolt backwards through the nutserts so I could have a stud on the other side of the fender.
The stud holds the knife and has handknobs so it'll easily come off and attach to my belt.
This works very well for other things you might want a stud for. A light in the closet, a phone mount on the dash.
Ilminenis a complicated use. Basically you drill a tight hole, jam one of these in it, expand it with the tool and have a threaded hole stronger than the material the rivnut was put into.
I could have ran the bolt through the front, but then I'd have to align the holes through the sheath possibly wet or in the dark.
The last pic is those big shrapnel rivets. That fender flare isn't going to come off by itself and it spread the clamping force across a greater surface area. A regular rivet would have cracked the plastic.
Edit
I remembered I had a test piece used to get the hole as tight as I could without needing a hammer.
Heres pics of a rirvnut front(flush) and back.
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