Westinghouse Turn-Knob Medium Base Brass Lamp Socket

2-circuit socket. Includes a third terminal to control a separate socket. Brass turn-knob socket for lamps with light in base and top. Ideal to replace worn or broken sockets in light fixtures. Threaded 1/8 IP medium base. Rated for 250 watts/250 volts. UL (Underwriter's Laboratories) listed.