The ToughArmor MB720MK-B V2 is a Ruggedized Removable Quad M.2 PCIe 4.0 NVMe SSD Enclosure design for a 5.25" optical drive bay and supporting up to 64Gbp/s data transfer rates via OCulink (SFF-8612) interface. It simplifies the process of installing or removing M.2 NVMe SSD by using the removable drive trays with tool-less adjustable M.2 drive locker, making it easy to change drives at any time without open the computer case or dealing with drive mounting screws. For best cooling performance, the MB720MK-B V2 is equipped with dual cooling fans in the rear to remove the heat generates by the high-speed PCIe 4.0 SSD. On top of that, each drive tray comes with an extra-large heatsink lid and thermal pad to ensure your SSDs are at optimal temperatures. As part of ICY DOCK's toughest line, the MB720MK-B V2 is made out of full metal construction with metal barrel key locks for maximum protection.