The 2-circuit turn knob socket can be used to replace a worn or broken socket or to build an entirely new light fixture. The socket features two circuits, enabling you to make this a 2-socket lamp by adding another keyless socket (not included) and doubling the light output of one lamp. The turn-knob switch is well suited to floor and table light fixtures, and the brass finish lends a classic look and effectively withstands heat. UL listed and CSA approved for safety, it is rated for 250 W maximum and 250 VAC. The 2-1/2 in H socket has a tapped 1/8-IP bushing and uses medium base bulbs. Thanks to its straight bracket design, installation is easy.