Leviton White Plastic Incandescent Lampholder with 4 Terminal Screws is designed to fit 3-1/4 or 4-inch outlet boxes, making it a versatile choice for various lighting needs. Featuring a durable plastic construction and a 4-1/2-inch outside diameter, this lampholder is built to last. It includes a medium base socket and is keyless and top wired for easy installation. Safety and quality are ensured with UL and CSA listings, providing reliable performance for your lighting fixtures. Model Number: 103-08829-CW4