Rivet Nuts - Countersunk

Using Countersunk Head Rivet Nuts:

Countersunk rivet nuts have a visible 90-degree countersunk and require a pre-drilled countersunk hole to enable them to fit flush. These rivet nuts can also be called countersunk bolts, but please note this style should not be confused with the reduced countersunk head rivet nuts which has only a slight countersink.