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.
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.