The Leviton 9875 Porcelain Lampholder is a white keyless lampholder designed for use with 660W/250V lighting fixtures. It features a 3 1/4 and 4" ceiling box size, making it suitable for various ceiling heights. The Leviton brand is known for its quality electrical equipment and supplies, ensuring reliable performance and durability in industrial and commercial settings. This lampholder is a versatile and essential component for maintaining proper lighting function in business and industrial environments. 2 Screws in Box.