The cable is used to connect e.g. an SSD with U.2 interface to a PCIe NVMe adapter with U.2 SFF-8639 port.

Specification
– Connectors: 1x U.2 SFF-8639 female > 1x U.2 SFF-8639 female
– Data transfer rate up to 32 Gbps
– Wire gauge:
– 30 AWG data wire
– 18 + 24 + 26 AWG power wire
– Supports NVM Express (NVMe)
– Length without connectors: approx. 50cm

System requirements
– One free U.2 SFF-8639 interface
– SSD with U.2 port

Package contents
– U.2 SFF-8639 cable