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:75mm~76mm <br/>ceramic height:31mm~33mm <br/>bakelite height:12mm <br/>length of iron stent:11mm~12mm <br/>screw terminals <br/>turn knob on/off <br/>e-26 medium base