Any idea what these are?

Don't recognize the particular application, but they're flush fit fasteners similar to a plow bolt. Not much wear on the head of the smaller one so I'm wondering why they're flush fit?

The small one looks familiar for some reason, I'm going to guess on a dozer or similar piece of equipment.

Edited to add: I've seen similar bolts holding flanges onto pressure vessels in my town job.
 
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My vote is along the lines of concrete anchor also, like tamed em noted. I only think this because I have smaller ones set in the concrete that hold the uprights perpendicular to the slab on my 40x60 shop. It was here way before I was.
 
Cinderblocks in strong flowing water and old style window weights in calm lake water for trotline weighs.
As a young teen, I saw cinderblocks used in the Red River just West of Texarkana and they weren't heavy enough. We'd try to tie at least one end to a tree at the edge of water or a big snag that had survived several high waters.
(My uncle had a fish market in New Boston Tx for years and sold his catfish and buffalos and my brother and I got to spend a week with him most summers).
 
Cinderblocks in strong flowing water and old style window weights in calm lake water for trotline weighs.
As a young teen, I saw cinderblocks used in the Red River just West of Texarkana and they weren't heavy enough. We'd try to tie at least one end to a tree at the edge of water or a big snag that had survived several high waters.
(My uncle had a fish market in New Boston Tx for years and sold his catfish and buffalos and my brother and I got to spend a week with him most summers).
I've got a whole pile of those old window sash weights i inherited.
Have three wrapped in a large amount of gorilla tape for my boat anchor
 

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