This ceiling mount porcelain lamp holder can be twist-lock mounted and comes with a pull chain to turn it on and off. It has a medium base, single circuit operation for easy connection, 660 max wattage and can be installed on a 3.25-inch or 4-inch electrical box. It features one-piece construction with a glazed porcelain body. This lamp holder fits a wide variety of applications and is easy to install in any room in the home. It is commonly used to add ceiling-mounted standard E26 sockets in closets, garages, basements, utility rooms and attics. This porcelain lamp holder is compatible with most light bulb types including LED, incandescent, halogen and CFL bulbs. It is UL listed and is backed by Maxxima for 1-year.