Heavy-duty manual hand rivet nut gun kit (commonly known as a rivnut or nutsert tool). It is used to install permanent threaded inserts into thin sheets of metal, plastics, or fiberglass where tapping threads is otherwise impossible.
Wide Metric Capability: The kit includes 7 interchangeable mandrel sizes ranging from M3 to M12 (specifically M3, M4, M5, M6, M8, M10, and M12).