Highlights: Knurled turn knob for ON/OFF control Electrolier design 1/8 IPS (27 tpi) tapped bushing mount with set screw - fits standard lamp stems - et screw prevents rotation of socket Rating: 250 watts, 250 volts Medium base socket - fits standard light bulbs Two circuit for 3-way light bulbs; operates dual filament lamps on sequence of LOW/MEDIUM/HIGH/OFF Aluminum with brass dipped finish