Strange Drill Bit

A

Allan

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Good day, fellow metalheads.
I picked these boring bits (for lack of a better term) in one of those boxes of "junque" that one often stumbles across. I am wondering if any one knows definitively what they are for? They appear to be for wood working since they are relatively thin and they have such a small diameter in the threaded shaft. They look to a very high quality steel body. Any ideas?

Al
15 Main St Grunthal 014.JPG15 Main St Grunthal 009.JPG15 Main St Grunthal 010.JPG

15 Main St Grunthal 014.JPG 15 Main St Grunthal 009.JPG 15 Main St Grunthal 010.JPG
 
I've got a lot of different types of woodworking bits - new, vintage and antique and those don't look familiar.
The bottom picture reminds me of a drill bit for glass, but not the other views.
 
That one that is marked #25 I have seen before, if I can find the reference, I will post the link.. let me see if I can find it.

Doc
 
Unique drills. I have never seen any like them. Perhaps George will have a look. He's pretty familiar with older methods. I'd agree that they are probably for wood, given the angles I see, but that's all I'd speculate on.
 
I think the ".25" was a garage sale price tag but I won't go to the rack over it.
Al
 
I think the ".25" was a garage sale price tag but I won't go to the rack over it.
Al

Also, they are 1" diameter and have that # stamped on them.
Al
 
The lower one has the same type of cutting edge relief that you find on a Speedbor. It may be for thru boring without blowing out the back side.

The threaded end is probably for a boring head. Is it a 7/16 thread? RH or LH thread? (Both are used.)
 
Old machinist, I thank thee.
So are they to drill the hole that the latch plunger slides through the door in, to latch into the door frame? Not sure that made sense.

Next question: what else can I use them for? Hmmmmm.....
Al
 
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