RockJocks custom machined, left hand thread, weld-in bung for use with forged Johnny Joint rod ends or any other 1 1/4 in.-12 thread rod end. Hex shaped – not round – for ease of bar adjustment. Also included with this bung is a custom machined jam nut that is the same hex size as the bung. Designed to fit into a tube with a 1 1/2 in. i.d.