RIVNUT CSK SEALED KNURL 3 X 15.5 A4

A rivnut is a tubular, internally threaded fastener designed to provide strong threads in thin or hollow materials. It is installed from one side by inserting it into a pre-drilled hole and then pulling or collapsing its unthreaded portion to clamp securely against the base material. This creates a durable, vibration-resistant anchor point for screws or bolts.