They sure are the smallest I have! Fully functional tool, actually Channel Lock brand Groove Joint Pliers. Got these from my Grandfather when I was cleaning out his basement. What would you even use something like this for? XD There have GOT to be more useful tools for work that small...

Channel Lock No. 424



They even still make them!

http://www.amazon.com/Channellock-424-2-Inch-Capacity-Tongue/dp/B00004SBCR

Ignition pliers. At least, they were "back-in-the-day"! 

They would be included in every ignition set...

I like mine, but I don't really use them that much.

I always had some for ignition work and other tight spots.

I've never seen a pair - cool

Haha, ignition work, eh? Like for setting points? I can't imagine these were more useful than, say, a box wrench o.o But, then, what do I know? They seem well made enough.

Not true
Not true at all

   I know guys who can move the world with these pliers.
This -is- the standard size, btw.
I can do some damage with a pair in my pocket, myself.
  I have, I don't know, maybe 6 pair or even 7 if you root around real deep. 

I have a most favorite pair but they wouldn't look much different in a picture than any one of 4 or 5 other brands.
They are a little different though.

   Oddly, they were the first pair I ever found. They look pretty normal, but they are just one gauge thicker steel. Same length and about the same size, but just one little gauge thicker.
  Man that is an important gauge of steel, to me. 

  Forget leatherman. If you work on machines,
   these.... pliers... rock.
     yours Scott

PS I also have a small pair of 4" slip joint pliers to go with.
These two pliers see the lions share of all common problems and procedures.
Try it for yourself. Get these two pliers in a reliable place where you can ALWAYS find them (this mean you have to put them back when you are done. Rules of the road sorry.)  .

Wait and see if you don't head for these little pliers, and kick the crap out of whatever is bothering you, time after time. 
   

Ignition pliers like noted before...actually the new ones look shorter in reference to your picture.

Heres a picture with "ignition" pliers and others for a size reference:

The blue handled channelocks are 4-5/8" long.


Chilly

I have a few pairs of these, used a Craftsman set today to squeeze the tubing locks on my grandsons S-10 fuel pump. I know it's an old post, but it's an old truck too. ;-)

Always kept a pair of these in my pocket when I started turning wrenches.   Great for battery post clamps too.  Full size pliers  don't fit those too well.   Of course tightening the nut on point sets.

Here are some small pliers -  the first four are kept in my tool box.  The other two in a box of misc. pliers.

More pertinent to this thread are these NASA groove joint pliers PL.5S USA, nicely chromed - I have 4 NASA ignition wrenches and one distributor wrench - interesting that they are all ignition related.
Unknown pliers with Vacuum Grip pattern handles and strange forged in mark, maybe a date code.
K-D No. 9 pliers.
Kraeuter 824 1/2 pliers/cutters marked on the opposite side "SUPREME".
Horrible quality pliers that appear to be Oxwall Japan.
The no brand flat stamped ultra cheapo pliers whose jaws don't even line up are actually slip joint pliers.

Quote from: Twilight Fenrir on August 06, 2014, 07:20:02 PM
Haha, ignition work, eh? Like for setting points? I can't imagine these were more useful than, say, a box wrench o.o But, then, what do I know? They seem well made enough.

Yep;  for reaching in and pulling/replacing the wire on the points/condenser, if your car used push-on terminals there; for retrieving the tiny little screw that retained the points when it fell out as you were carefully putting the points in place in the distributor; and so on.  I've never seen a Channellock pair until now.

We carried 424's in the front pocket  of our bibs. 

When hanging pipe most (up through 4", anyway) is hung with 3/8" all-thread rod.

They are a perfect size for turning that rod.

Chilly