Leviton Black Turn-Knob Medium Base Phenolic 3-Way Interior Lamp Socket is an interior turn-knob style lamp socket designed for reliable and safe use. This lamp socket features backed out screw terminals, making installation straightforward and secure. It fits a 1-13/16 inch diameter socket cup, ensuring compatibility with a variety of fixtures. The socket includes a mandrel that is insulated from the mechanism and is threaded 4-36 for the knob, providing durability and ease of operation. Its phenolic construction excellent heat resistance, making it i for interior lighting applications where safety and performance are paramount. Model Number: 028-07090-00M