Many of the new generation of power supply units are being manufactured with all SATA power connections instead of the traditional 5.25 inch molex power connections. This adapter allows a device fitted with a 5.25 inch molex power plug to be powered from a SATA power supply connection.
This adapter can also be used in conjunction with power PCI express power adapters to enable PCI express graphics cards to be power from all SATA PSUs.
Note: Two of these items are illustrated for clarity. Actually supplied in multiples of one.