Got these items at estate sale today.Two of them are of unknown usage. Please enlighten me if you recognize them.
Top one is shaped like a tapered reamer. It is 6 /4 inchs long. Bit brace tool. Has center punch like end which I believe to be from factory. edge not sharpened.
Second tool is like a coupling. It is 5 1/2 inchs long. Slots are 1/2 and 7/16 wide. It is stamped G.A. Johnson.
Tools were 50 cents each and yes the Snap-On was the one I grabbed first.

A reamer, yes, probably for tapered socket tenon joinry. "A reamer is used to ream the hole to match the tapered shoulder of the tenons."

The coupler looking tool below it might be for making round tenons.

Just because it looks like a reamer doesn't make it a reamer.

It does make holes larger though, and does it in sheetmetal.

Back in ancient times 1950± before plastic grommets in every available size, a tinknocker would first punch a hole with a flatface punch using the end a block of hardwood as a backing die. 
From that hole, the tapered tool would be inserted and rotated to enlarge & curb the hole usually over a hole in the benchblock..
That results in something that looks like the male half of an eyelet.

At that point, depending on what the hole was needed for either a ball peen or the tool was used to roll the curb down.  The process is similar to double flaring a piece of tubing.

The Goodell-Pratt catalog #16 lists this tool as No. 397 square reamer.  An octagonal version, No.  398, was also available.

Quote from: Aunt Phil on June 03, 2012, 10:43:12 PM

It does make holes larger though, and does it in sheetmetal.

Back in ancient times 1950± before plastic grommets in every available size, a tinknocker would first punch a hole with a flatface punch using the end a block of hardwood as a backing die. 
From that hole, the tapered tool would be inserted and rotated to enlarge & curb the hole usually over a hole in the benchblock..
That results in something that looks like the male half of an eyelet.

At that point, depending on what the hole was needed for either a ball peen or the tool was used to roll the curb down.  The process is similar to double flaring a piece of tubing.

I believe I have one of these, too.  I'll have to try this idea out.  Thanks!