Connects one internal IDC50 SCSI CD/DVD or hard drive plus provides an external port for additional devices. This cable has PVC coated wiring to allow maximum speed. The port is mounted on a metal slot bracket with a Centronics female connector. It allows you to utilize your internal SCSI controller for external drives eliminating the need to buy an additional SCSI PCI card. (Connectors: 2 IDC50 Female Internal - 0, 24 Inches and 1 Cen50 Female External - 42 Inches)