Steampunk Industrial style Black Iron Pipe fitting Lamp Socket, Lamp holder with 5" wire leads (pigtail). 3/4" NPT(National Pipe Thread) female Pipe thread. Approximately 2-1/2" tall; 2-1/4" outer diameter at the top. Hard rubber Socket is 250V 650W rated. For Standard medium screw (E26) base bulbs. Free shipping for USA only.