The optical adapter is used to connect optical patch connectors and patch cords. Adapters are used in patch panels, active network equipment and measuring instruments. The SC adapter body is made of plastic and the colors are set according to the adapter type. Beige is used for multimode applications and blue for singlemode applications. The adapters are straight-through and also serve for precision centering of connector tips. The use of adapters is widespread in fiber-optic communication networks. Their main advantages are high performance, temperature stability and low wear.