This is a Cisco® CAB-STK-E-0.5M compatible 50cm (1.6ft) FlexStack male to male black stacking cable that is used for high speed data transfer. This part is specifically made to work with Cisco® devices equipped with FlexStack ports. This stacking cable features FlexStack to FlexStack connectors for connectivity between network appliances. These cables are application tested and guaranteed to work 100% of the time.