Standard ST™ fiber optic connector for Telecommunications (USA), LAN, Industry, Medical and Sensors applications. ST™ Standard fiber optic connectors comply to IEC 61754-2 & CECC 86 115-801 standards. ST™ Standard mating adapters (metal) can be used for all ST™ fiber optic connectors (not only Diamond versions). All adapters contain a high quality zirconia ceramic sleeve.