TheCraneGuy
Well-known member
I recently purchased a Snap-On toolbox for work, KR 558B with a KR 533A on top. I have added a picture of my prize. 
Ironically, the previous owner was located about an hour and a half from the Snap-On Algona plant, but I don’t think this set was made there. The stamped nameplate did say 72.

But I digress...
If you look closely at the top box, to the left and right, on top edge, there are socket rails screwed to it. On them are mounted several of these.



I have never seen one before, there are no numbers on them, just what you see, the older logo.
I have been searching the internet at images of what I think it is, but haven’t seen anything remotely close.
Any help is appreciated.

Ironically, the previous owner was located about an hour and a half from the Snap-On Algona plant, but I don’t think this set was made there. The stamped nameplate did say 72.

But I digress...
If you look closely at the top box, to the left and right, on top edge, there are socket rails screwed to it. On them are mounted several of these.



I have never seen one before, there are no numbers on them, just what you see, the older logo.
I have been searching the internet at images of what I think it is, but haven’t seen anything remotely close.
Any help is appreciated.