Fiber optical coupler use it for distribution boxes, patch panels, wall mounts or other applications. With the fiber optical coupler you can easily link two fiber optic patch cords. The dimensions of keystone modules all follow a standard so they can be mounted easily on suitable holders. · Connections: ST-Simplex jack to ST-Simplex jack · for polishing type: Ultra Physical Contact (UPC) or Physical Contact (PC) · Alignment Sleeve Material: ceramic · for fiber mode: Multimode · for category: OM1, OM2, OM3, OM4 · Mounting type: without flange, Keystone version · Connector style: Simplex · Working temperature: -40 to +85 °C · Storage temperature: -40 to +70 °C · Color: red · Housing material: metal, ABS with dust covers