It's a power cable adapter.
Great price. Eliminates lots of clutter when using SATA drive with older power supply. With both plugs combined it stays connected to drive better as well.
Good approach to convert older PC power supplies to power SATA HDD. Better fit using this than seperate power and data cables.
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83-11822 - 7-in-1 Computer Case Screw Combo Kit
Perfect for replacing missing screws, or silencing your PC.
83-13383 - 17" SATA Power/Data Cable
Serial ATA cable which has both the data and power connectors integrated into one plugSATA 1.0 compliant, up to 1.5GbpsPowered by 4-pin molex connector
58-16275 - 550W ATX Power Supply
This 550W power supply comes with dual quiet 80MM fans, one on the top and one on the back. The whole body is coated with thick glossy paint for a sleek look in any environment.
83-13382 - 7" SATA Power Cable
7" SATA power conversion cableConvert from 4-pin molex to 15-pin SATA powerUpgrade your computer to SATA even if your power supply has no SATA outputs
MCM Cat 57, Page 346
MCM Cat 56, Page 321
This was not my first order I keep coming back, satisfied again.