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