Features: With this PCIe X4 adapter, M.2 PCIe SSD can operate at PCIe X4 full speed. It is like being installed directly on the control board, and the speed is basically unaffected. M.2 to PCIe4.0 X1/X4 adapter card 64Gbps;Support NVME protocol PCIE4.0 backward compatibility All aluminum heat dissipation and dust prevention - strong compatibility M.2 adapter card PCIE4.0 X1/X4 expansion NVME protocol universal PCIE slot 2 brackets package applicable to servers Specifications: Item：M.2 to PCIE4.0 Adapter Material: Aluminum Alloy Types: X1/X4 Speed: 64Gbps Support M.2 PCIe NVMe SSD 2230/2242/2260/2280 Size Package Includes: 1PC M.2 to PCIE4.0 Adapter 2PCS Brackets note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.