universal porcelain ceramic rotary socket knob switch e26 light 250w 660w 250v motoku specification: <br/> <br/>250vac <br/>material: porcelain <br/>3/8" threaded nipple <br/>total height:95mm~96mm <br/>ceramic height:31mm~33mm <br/>bakelite height:12mm <br/>total length of iron stent:38mm~39mm( include the height of iron thread 10mm) <br/>screw terminals <br/>turn knob on/off <br/>e-26 medium base