This Brass Side Entry 10mm Couple is a basic and simple way to get a flex into a lampholder when the cable cant come through the lamp. It screws onto a 10mm male thread like a backplate or Alltherd and allow a lampholder with a 10mm female thread to be screwed on to the top.
Please note however that this side entry couple does not have any form of cord grip so should only be used with a lampholder that has its own cord grip facility.
Height excluding the top male thread is 19mm.