E-26 Base Porcelain Grounded Lamp Socket with 1/8ips Threaded Cap. Lamp Socket is Prewired with 48in Long 18/1 Teflon 200 Degree Wire Leads and Bare Copper Grounding wire. Nickel Plated Copper Screw Shell.  Rated Maximum 660 Watt, 250 Volts. UL Listed. Documentation UL Documentation