This Addonics M2 Flash drive kit turns a regular M2 PCIe or M2 NVMe SSD into a 2.5" U.2 SSD. The drive frame mimics the exact size and mounting holes location of a 2.5" SATA hard drive. So once the M2 PCIe or NVMe SSD is mounted inside this 2.5" M2 Flash drive, it can be used just like the standard 2.5" U.2 NVMe SSD. This allows installing the M2 PCIe or NVMe SSD into a drive bay instead of the PCIe slot. The drive can then be connect to a SFF-8643 connector in the system via a SFF-8639 to U.2 cable, resulting in a drive with the same high performance as if the M2 PCIe or NVMe SSD is installed into the PCIe slot.