Three bars on a shelf, one tidy feed. This 1 metre splitter ties three Flex II 10 or Flex II 20 lights together on a single level. The clever bit is the fourth socket, kept free for a drop cable to the shelf below, so a tall rack runs as one unbroken chain.
WDC19 connectors run throughout, with the main lead at 55 cm and the branches between 13 and 29 cm.