Cisco 37-0891-01 is a FlexStack cable for stacking network switches. It provides the cable connection used when setting up switches as a stack, keeping this link purpose-specific for compatible Cisco equipment.
At 50 cm long, it suits a short connection between nearby devices in a rack or equipment area. This is a straightforward stacking cable for network setups that use the FlexStack connection; it is not a general-purpose network patch cable.