Stacking Flex II bars on a multi-layer rack? This short 0.6 metre cable carries power from one shelf down to the next. The WDC19 connectors at each end are IP65 rated, so they shrug off the damp of a propagation area, and they join a Flex II 10 or Flex II 20 on one level straight to the level below.
The length is cut for the usual gap between rack shelves, leaving barely any slack to tuck away.