Suitable for the type 86 dark outfit , socket, led step stair lighting mounting box Recessed into the wall, Suitable to be buried in concrete, which the apartment hasn¡¯t renovated Easy Installation, light weight, transport & Resistance, resistant to acids, bases and salts High strength, resistant to compression and , resistance, with self-extinguishing function. Non-conductive, good insulation, able to resist 25KV , assuring a .