RivetNut Install

Rivet nuts are installed using a tool like this one. It uses different fittings (called nosepieces) for each screw size such as #8-32. #8 is the diameter and 32 is the number of threads per inch. This ad is from Harbor Freight.

closeup shows threads below the tube that gets pressed on both sides of garage door.
Put the rivnut on the 8-32 nosepiece.
use tool to pull the metal so it spreads out
This is the way it looks when set properly.