The Icy Dock ExpressSlot Elite MB840M5P-B turns a free PCIe expansion slot (x4, x8 or x16) into a tool-less, removable bay for a single M.2 NVMe SSD, fitting drive lengths from 2230 up to 22110. Its aluminium tray doubles as a heatsink, with a thermal pad for contact, and the card fits both full-height and half-height slots. Note: the catalog listing describes this as a "PCIe Gen4" adapter, but Icy Dock's own datasheet for this exact model number (MB840M5P-B) specifies a PCIe 5.0 x4 interface (128Gb/s, double PCIe 4.0's bandwidth) — worth a physical check against the unit on hand, since Icy Dock also sells a visually similar PCIe 4.0 x4 model under the different part number MB840M2P-B.