Keystone Terminals 7798 Screw Connectors are a type of snap-in vertical header with a M4 thread. They are designed for use in printed circuit boards (PCBs) and provide a secure connection between two components. The terminals feature a durable construction with a high-temperature rating and are available in a variety of sizes and colors. They are suitable for a wide range of applications, including automotive, industrial, and consumer electronics. Features include a low profile design, easy installation, and a reliable connection. Applications include power supplies, motor control, and signal transmission.