1.The D-sub connectors are often used for serial port connections, which enable data transmission between devices, such as in computer serial ports and other widely used computer peripheral parallel ports. The D-sub connector is an electrical connector commonly used for serial port connections in mechanical equipment, CNC (Computer Numerical Control) machines, and computers. 2.Product Name: IDC D-Sub Ribbon Cable Connector; Connector Type: Male; Number of Positions: 9; Number of Rows: 2; Overall Size: 31mm x 12mm x 20mm/1.22 inch x 0.47 inch x 0.79 inch (LWH); Package Includes: 25 x D-sub Connectors. 3.The female and male adapter of the D-sub connector connection between the cable and connector is very easy to connect and creates permanent connections from cable to connector.Easy to use and install, suitable for a variety of applications and projects. 4.Plug the D-sub connector into the appropriate port on the machine or CNC computer. Use the appropriate tool to crimp the connector securely into place. Ensure the pins are properly aligned for a successful connection.