The on/off turn-knob phenolic socket can be used to replace a worn or broken socket or to build an entirely new light fixture. The socket's on/off turn-knob switch is well suited to easily reachable table and floor light fixtures, and its phenolic construction makes it highly durable and heat resistant. UL listed and CSA approved for safety, it is rated for 660 W maximum and 250 VAC. The socket has a threaded 1/8-IP bushing and uses medium-base bulbs. Thanks to its straight bracket design, installation is easy.