The ST-ST Duplex Singlemode 9/125 Fiber Optic Cable is the ideal solution for connecting patch panels and network devices that utilize ST to ST style connectors and require 9/125 Single mode cabling. Each cable is 100% tested. The 1/1 markers make it easy to identify the connector on each end of the assembly, ensuring a hassle-free installation process. Upgrade your cabling with this reliable and high-performing fiber optic cable.