Brass plated extension for building new lamps or repairing older lamps, Brass Plated Offset Lamp Extension Pipe.....ADJUSTABLE LENGTH Hollow pipe....you can pass a wire through it. Brass Plated Two Piece Adjustable Extension for Lamp.... The brass pipe assembly is 10-1/2" and the bottom attaching nipple is 3/4". Adjustable in height from 10-1/2" to 15". Threaded top and bottom and includes nuts and washers for fastening. Lamp cord can pass through the hollow pipe. The OD of the bottom pipe is 1/2".The OD of the inner pipe is 3/8". Offset is approximately 2 inch.