This signal does not include the post which is a section of K&S brass tubing with a Dia. of 3/32" or 2.4mm. See: http://www.ksmetals.com/26.html The signal will accept 3mm LEDs on the main aspect and 2mm or 1.8mm LEDs on the feather. Other items such as Fog Repeater and Rail Gap Indicator are available which will slide onto the same pole.