"PASS & SEYMOUR" 3-WAY PORCELAIN TURN KNOB SOCKET *750 watt, 250 volt *Mogul base lampholder *Removable turn knob *Two circuit hickey tapped 1/4" IPS x 7/8" high *Screw terminals *UL listed, CSA approved *Boxed *Discovery NBR, SUP, HWU