The Lucky Reptile Thermo Socket Cap consists of flexible black silicone and is simply pulled over the porcelain socket. It is not necessary to take apart the lamp to install the Thermo Socket Cap. The cap recommend when using high wattage lamps at it will insulate the hot lampholder. Also it will improve the optical appearance of most luminaires. The Thermo Socket Cap is suitable for all Thermo Socket plus Reflector with external lampholder as well as the Thermo Socket /PRO models.