Pack of Two Medium base E26, Phenolic 3-Way Turn Knob Lamp Sockets for one low price! 250W-250V, 1/8 IP Cap, Medium Base Sockets w/Uno Thread and Ring. UL Listed Rated for up to 250 Watt. Use these sockets with standard base three way light bulbs. Easy to use 2 piece shell design allows for easier wiring of internal socket. Always make sure lamp cord is unplugged prior to rewiring any lamp. Threaded top of socket is 1-5/16" diameter across. Socket is 2-3/4" high overall. Ring has a 2-1/8" outside diameter. Bottom of socket is threaded 1/8 IP standard lamp thread.