QE QUALITY vapor proof portalamp body and guard cage are made of die cast aluminum and finished in epoxy powder coating paint for long lasting life. Socket is standard porcelain body with copper shell connector. Accepts standard 100 watt bulbs (not included) with clear limeglass globe. Designed to work up to -40 degrees Celsius / -40 degrees Fahrenheit, overall size is 4-1/4″ (108mm) diameter, 9-1/4″ (235mm) long including wire guard. Threaded plugs are provided for openings when not being utilized. Conveniently individually boxed and packaged.