Uxcell Rivet Nut Carbon Steel Knurled Flat Head Threaded Nuts Black 50 Pcs 0.82" x 0.66"

A Rivet Nut fastener is a tubular rivet with internal threads.
The material is too thin to machine the thread.
It requires a tool or device to install in seconds from one side of the work.
The added benefit of not only being a reliable fastener, but they are also ready to use with clean threads available for screw attachments.
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 workpiece.