This product is either discontinued or we cannot get that from suppliers.
Qnap CAB-SAS05M-8644-8088 SAS external cable, Interface SAS 6Gbit/s, Length 1.6 ft, Black, Connector 36 pin 4x Mini SAS HD (SFF-8644) - male, Connector (Second End) 26 pin 4x Mini SAS (SFF-8088) - male.
QNAP CAB-SAS05M-8644-8088 Mini SAS external cable (SFF-8644 to SFF-8088), 0.5 m.