it comes with 20 pieces of LC single mode fiber couplers and a metal storage box in silver color, which can quickly work LC cable extension; The rich quantity meet your needs for daily application and replacement these LC fiber optic adapters can help to deliver good performance to your network, which are ideal for single mode, simplex or duplex application our single mode fiber LC coupler adapters meet all industry standards, and every optical coupler is tested to their quality, ideal for any LC optical cable extender; Featuring low insertion loss and high stability these LC to LC UPC fiber connectors come with a sturdy metal container, which measures about 3.94 x 2.76 x 0.79 inches/ 10 x 7 x 2 cm that can keep your connectors organized, preventing them from loss and breakage those LC single mode fiber adapters can be applied on various occasions, such as optical communication system, optical instruments, CATV, fiber optic broadband access network, optical fiber sensors and more Features: Design for minimal signal degradation, these LC single mode fiber connectors deliver insertion loss less than 0.2dB, suitable for speed data centers and long distance fiber links. Those LC simplex single mode fiber adapters can be quickly installed in place. Specifications: Material: Box: metal Color: Coupler: blue Box: silver Size: Box: 3.94 x 2.76 x 0.79 inches/ 10 x 7 x 2 cm 20 x LC fiber coupler 1 x Metal storage box Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays. Package Contents: 1*set LC fiber coupler Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.