Intermatic photo control is made of die cast zinc and has a size of 1.9375 Inch x 3.750 Inch. It features single and multivolt models in both stem mount and stem mount with a swivel. It has a tungsten load rating of 3100 to 4150 Watts and ballast load rating of 1700 to 2300 Watts. A washer gasket and locking nut are packaged with each photo control. Also known as -INTERMATIC K4423M 15A 208-277V Stem Mount T Die Cast Photocell-Intermatic K4423M K4400 Series Thermal Photo Control 208 - 277 Volt AC Cadmium-Intermatic K4423M Photocell, Stem Mount Photo Control, Thermal Type w/Heavy Duty