Enclosed 12-Port rack mount optical fiber interface cabinet provides a safe and clean environment for sensitive optical cables, breakouts and splices. Heavy gauge USA-made steel 1RU rackmount box with removable cover and high quality zirconia sleeve fiber connectors for precise optical alignment and low insertion loss for long lasting durability. Metal dust covers on ST models. Twin access points on the rear for feeding cables through easily. Equipped with cable management and cable routing accessories to limit bend radius and add strain relief. Designed to fit in a standard 19" rack/cabinet. Features Single Mode, simplex, UPC connectors!