The LC and SC adapters are designed in Zirconia sleeves, different colors are available depending on its mode, green for single mode APC, blue for single-mode PC and grey for multi-mode. The couplings connect the glass fiber connectors with the same or another connector types. Its standard has been approved by LC, SC, ST, and EIA/TIA for the compliance with IEC standard 61754-20, 61754-4, 61754-2. With its standardization procedure, this product will never be out and available in the market.