Drill Bit

[Model 12]

These drill bits are extremely old. The heavy bit in the middle -- can anyone tell me what it is?

[lptools]

Looks like a Countersink for a Bit Brace.

[coolford]

That is what it is and does.

[wvtools]

It looks like the kind for metal.  Some of those do wood or metal, but I would need a better photo of the tip.

[Model 12]

Hi wvtools
Rust is off, that should help.
There's some engraving that showed up. I see 70 degrees is part of it.
And:    STANDARD TOOL CO. U.S.A.

[wvtools]

Standard mostly made metal working tools, so I would say it is a metal countersink.  Page 302 of their 1925 catalog shows something close.  It does not list the angle, but you could get it in 82 degrees for screws, 60 degrees for tire bolts and 35 degrees for sleigh shoes.  It was the No. 135 countersink.

[Model 12]

Hi wvtools,
Could the intended use have been to increase the inside dimension of pipe, such as creating a chamfer?

[Model 12]

Until a few days ago I was convinced this was a countersink for metal. I even found a photo of a Standard Tool Co. Countersink Set. Wasn't so easy, cause I was a welder at a shipyard for cargo ships. I kept picturing someone trying to drill in a hull using this with a brace.
Then I was looking for 1" Copper Pipe on Amazon when on the same page, I saw this picture. It says it's, "Takagi ....Inner Reamer. #1 Best Seller (for) Chamfer End Mills....  For interior chamfering of Stainless Steel, Brass, Hardened steel, Copper........(pipe)"
I appreciate all the assistance in chasing this mystery, but I'm sure all who took the time to reply will understand my recent uncertainty.

[lptools]

Hello, Model 12. I wouldn't go with Amazon as a source for tool descriptions, they are often inaccurate. The bit you originally posted is a Countersink, we're still uncertain if for wood or metal. Any metal cutting countersink could be used to create a chamfer on the inside of a pipe, maybe the cutting angle is different for that use. The Standard Tool Center Drills you posted would drill and countersink in one operation. The countersink you posted would be used to taper the edges of an already drilled hole, so that task with a brace would not be so bad!