Slot brackets

They are called brackets when attached to an expansion card When used by themselves to simply cover an expansion slot in a computer's case,

bracket for PC, also called slot bracket or card holders Those are equipped with cut-outs which offer a secure mechanical connection of the IO connectors

pcie 4 nvme in pcie 3 slot 80-90mm Dual Fan Rack Mount PCI Slot Cover Bracket Video Card Cooling : : Computers & Accessories

pcie slot gpu slot solution Single slot IO bracket offers the possibility to use adjacent slot PCIe bracket Compatible with reference design GeForce® GTX 1080 Ti