It is not clear if they are best referred to as hooks or eyes. That makes identification more difficult. Possible useful search terms might be 'M6', 'threaded', 'BZP', 'folded'.

They could be useful if the threaded part is upwards, hence the other end is horizontal. You could almost throw a cable at them and it would drop into the eye. Maybe they are used with a chain to suspend strip lights.

Hangers for chain sounds good to me

… and let’s not get into assigning ‘personal pronouns’ to the poor innocent things … please.

MichaelG.

In North America this style of threaded hook was used for rigging residential TV aerials and their tripod towers just FYI, 1950's to 1970's era, before cable TV, and later, Blockbuster, satellite TV, Netflix etc. ate over-the-air TV's lunch.

I think pgk & Jeff are close on the money, aren't they for pulling 'angle members' against a flat surface, the 'tang' at the loop end bears on the internal flat of the angle to keep the 'face' of it in firm contact with the supporting surface – the 'flat' bit of the 'L' projects outwards like a shelf into the loop.

Edited By DiogenesII on 16/10/2022 10:02:57

So for holding down roofs, explains those huge shanks and the curved loading point directly beneath the shank

Edited By Ady1 on 16/10/2022 13:49:47

Martin
Was there also square nuts, plastic washers and covering caps? although I have used the J hooks for other purposes, so have some but not the washers and caps. The shape seems better to hold the sheets on angle iron rather than concrete.John did better than me at finding them, when I initially suggested use for roofing sheets I only found the J hook shape from a quick search.