The tool is used to rivet two thin pieces of metal together.Drill a hole in the metal to be riveted, the size of the hole depends on the size of the rivet.Place the long part of the rivet in the tool and the short part in the metal and squeeze the tool together a few times to swell up the part in the metal.Squeeze until the stem of the rivet pops off.

Rivet Gun.

It's a pop rivet tool.

You choose how to use it.

https://www.google.com/search?q=pop+rive...