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This set includes two identical 21-inch SATA power splitter extension cables. Each cable uses one 15Pin SATA male connector to connect to the power supply, branching out to five separate SATA female ports to power up to five storage devices from a single PSU line. The extra-long cable length solves distance limitations for multi-drive racks and large PC cases, making internal cable layout much more flexible. Premium conductive internal wires guarantee consistent power supply during long-duration read-write tasks without performance instability. Plug-and-play with no extra drivers or installation tools needed, ideal for DIY high-capacity storage workstations, RAID servers and multi-disk media editing rigs.