The M.2. adapter turns a regular M.2/NVMe drive intoa 2.5 U.2 SSD. This allows installing the M.2. device to a drive bay instead of a PCIe slot. The drive can then connect to SFF-8643 connector in the system via a SFF-8639 to U.2 cable, resulting in a drive with the same performance as it would be if it had been installed on a PCIe slot."Package Contents: 2.5 U.2 (SFF-8639) to M.2 NVMe 2.5" Housing 1 x Copper Nut 1 x M3x3 Screw, M3x5 Screw, M3 Nut 5 x M2X3 Screw (for Adapter), M2x3 Screw (for Housing) Certifications & Standards: CE FCC Environmentally Friendly: YesEnvironmental Certification: WEEECountry of Origin: ChinaPackage Contents 2.5" U.2 (SFF-8639) to M.2 NVMe 2.5" Housing 1 x Copper Nut 1 x M3x3 Screw, M3x5 Screw, M3 Nut 5 x M2X3 Screw (for Adapter), M2x3 Screw (for Housing) "