The horizontal phenolic snap-in socket can be used to replace a worn or broken socket or to create a new handmade light fixture. Its horizontal alignment makes this socket ideal for flush mount fixtures. The phenolic composition is durable and heat resistant and its snap-in design means the socket exceptionally easy to install. This socket uses one medium base bulb and fits into a 7/8 in by 1/4 in hole. It is UL listed and CSA approved for safety.