The ABB product CR420MAS is a set of hold down clips designed for use with relay sockets rather than the relays themselves. Each packet contains two clips that help keep relays securely in place, preventing any unwanted movement or disconnection during operation. These clips, sometimes referred to by their catalog number 783166604489, offer a simple yet reliable solution to ensure your relay setups stay rock solid. Distributed by BSP Automation, this accessory is a handy little component for maintaining stable and safe control systems.