StarTech.com M.2 NVMe SSD to PCIe x4 Mobile Rack/Backplane with Removable Tray for PCI Express Expansion Slot, Tool-less Installation, PCIe 4.0/3.0 Hot-Swap Drive Bay, Key Lock - 2 Keys Included. Host interface: PCIe, Output interface: M.2, Expansion card standard: PCIe 4.0. Product colour: Black, Silver, Purpose: PC, Mean time between failures (MTBF): 10000 h. Data transfer rate (max): 64 Gbit/s. Width: 120 mm, Depth: 167 mm, Height: 19 mm. Package width: 151 mm, Package depth: 230 mm, Package height: 46 mm