What are these Machinist tools?

[Cue]

A few years ago I bought a lot of Machinist tools items from a estate sale and I am now going thru some of the small junk that was in boxes. I dont know what these tools are for, I am pretty sure they are homemade. They have a square hole all the way thru them with a Allen screw in one end threaded into the square hole.
They are all different sizes from about a inch to 3" and different diameters.

Cant figure out what they could be used for, any ideas?

 

[454ragtop]

Guessing they're to turn square stock in a lathe, using collets or a 3 jaw chuck.

 

[Jim Johnstone]

Could also have been used to drive large taps that couldn't be held in a chuck. Set screw the square drive of the tap in the part and then hold the part in an ER or 5C collet for example.

 

[Cue]

The square holes do fit taps of different sizes so they could be used like a tap extension but only for a thru hole gun tap as the Allen screw in the end would just come out if a tap was backed out as it is in the end, not the side. The square holes aren't large enough for large taps 1/2" is about the largest that will fit in them.

 

[pstemari]

Holders for a square broach? The set screw in the end could adjust the depth.