Ingco hand riveter (also called a pop rivet gun or blind rivet tool).
What it’s used for:
A rivet gun like this is used to install blind/pop rivets — fasteners that join materials (especially sheet metal, aluminum, plastic, etc.) from one side only. Very common in automotive work, HVAC, metal fabrication, roofing, and general DIY/repair projects.
You squeeze the handle to pull the rivet mandrel until it snaps off, leaving a clean, secure joint.