ST to ST Fiber Optic Coupler - Single Mode/Multi Mode - 10 Pack - Commercial Quality COMMERCIAL GRADE: High Quality ST to ST fiber optic coupler / adapters for use in single-mode or multi-mode applications. Connects 2 ST single or multimode fiber-optic cables together RELIABLY TESTED: Every product is tested after production, and is Rohs compliant. We rely on these couplers for use in our clients fiber networks across the USA. USEFUL DESIGN: Free-hanging or panel-mount design. Couplers protect against debris and contamination. Precision tooled metal with close tolerances for exact fit DIMENSIONS: 2.5 x 8 x 0.5 (10 pack) TRUSTED SUPPLIER - Since 1989, Pacific Satellite Inc has been installing commercial CATV systems and networks throughout the USA. We independently source our own brand high spec suite of fiber optic products for HDTV, SDI, and Analog MATV systems.