Ekornes Stressless recliner chair bolt screws back or backrest to the metal base on their chrome, bronze, copper, or black 1970 era armchairs this part is used and is 34mm long. #11B

It has a length or depth of 34mm.
The smooth part of the shank is 8 mm across and designed to slide through the unthreaded hole in the metal backrest.
Those threads are course with a diameter of 5/16 and a pitch of 18 which grabs onto the threaded hole in the chrome, copper, bronze, or black metal chair base.
That rounded head is 14 mm wide with the drive style of a 5mm Allen hex screwdriver or a bit.
It is made of some kind of metal and the color is Steel.
This is a genuine OEM part for the Stressless furniture line by Ekornes.

This part is pre-owned, was not cleaned, needs touch up paint, to be oiled, the fit of the Allen bit is a little loose, so you will have to be careful when loosening or tightening.

Please let us know if you have any questions.

If you want multiple parts we can combine shipping.