What are these?

[RivennHewn]

Never seen these before.

Any ideas of intended use?

 

[Plombob]

Looks like a combination of drill guide and sheet metal flanger.

Never seen one before, but I want one!

 

[mds5951]

Looks like a hand seamer. To bend sheet metal. Only time I used them was to Bend flashing while doing a roof. I'm sure tin knockers/hvac would use them often

 

[RivennHewn]

I have hand seamers, but what's up with the holes and notches?

 

[Outlawmws]

Any name or patents on them? I agree, those are the oddest hand seamer/Sheet metal tongs I've seen.

I'm going to guess those are specialty for aircraft sheet metal...

 

[Outlawmws]

And you are not that far from Boeing...