PCIe x4 adapter and extender with x16 slot and x4 goldfingers for various PCIe slots.
Used to increase the height or extension (0.8") of your PCI-E or, acting as a wearout protector or an adapter to enable your add-in card w/PCIE x16 interface to plug to the motherboard motherboard PCIE x1, x4 or x8 slots.