The CCK-KIT-CD is a conduction-cooled keying kit designed to provide a standardized keying method for ruggedized systems that do not use front panels. This kit provides a complete 'CD' keying configuration, including Gold Chem Film aluminum brackets for both the plug-in module and the backplane, along with the necessary mounting screws and washers. It enables one of six unique configurations per bracket set, offering a robust and reliable solution for ensuring correct board mating in military and other demanding applications.