URBEST® 50Pcs Steel Rivet Nut Rivnut Insert Nutsert 3/8-16;

A RIVNUT fastener is a tubular rivet with internal threads.
It can be installed in seconds form one side of the work. Once installed, no finishing work is required on the RIVNUT fastener.
The added benefit of not only being a dependable fastener, they are ready to use with clean threads available for screw attachments.
Blind thin sheet materials that are too thin for a tapped thread.
Blind Rivet Nuts also are used when an application has little or no access to the backside as they can be installed from the front side of the work piece.