Technical advice

[glasagusban]

They’re for cooking meth.

[habanerocat]

From the Breaking Bad set?
Could be worth a few bob.

[habanerocat]

There’s a hex key under the male part. Obviously has some function.

[TreatyStones]

Try a reverse image search in Google

[habanerocat]

Thanks, It’s all coming back to me now.
Tried that years ago, no luck and nothing coming up now.

[habanerocat]

I zoomed in on the top photo and it came back with this.

Looks like they are rear ride height adjusters for a cars suspension system. Thanks Treaty.