Rivet nut size (A.K.A. diameter) is the size bolt that the rivet nut is used with. The same is true of the thread count. Thus a 1/4"-20 rivet nut fits a 1/4"-20 bolt.
10-32 is a fine thread, but it is listed under coarse thread because it is very common.
Various hand tools and accessories for installing rivet nuts.
Drill bits are cutting tools used to remove material to create holes.
A type of nut used to create internal machine threads in wood or similar materials.
For adding a load-bearing machine thread to thin sheet material applications.