Early French fuzes or industrial?

[Vasco Da Gama]

Pictured are 2 heavy brass screws that turned up amongst some other ordnance related items in France. I have a feeling they are industrial items or potentially light fittings! I thought to post for general interest and my education if anyone has come across these items before. They are both 62mm long, larger darker one has a thread diameter of 25mm and is 38mm across the top. The smaller lighter one has a thread diameter of also 25mm but is 31mm across the top. I would suspect some sort of transit plug but both have the remains of copper wires running through them. Any thoughts?

 

[Snufkin]

Variants of what the Germans called Reibzündschraube (friction igniter, screwed); WWI era used to fire the propelling charges in some models of Minenwerfer.

The attached probably came from a previous thread, so with acknowledgements to whomever first brought it to attention.

 

[Vasco Da Gama]

Many thanks Snufkin, excellent identification, you live and learn. The pull ring explains the copper wire remains in both examples.