What is it- auction grab bag

[tarbellb]

Been organizing the shop lately, went through my bits box and found these from an auction grab bag.

Some sort of collets, unusual some have no detents or flats?

And the hand operated bits?

Any insights, thx

 

[RTM]

The drills on the top row look like Machine Bits, originally associated with a blacksmith's post drill, where every drill had a 1/2" diameter shank. Makes for a much faster change out on modern machines, don't crank the tool chuck open, loosen and tighten a set screw and go.

The Cleveland Twist Drill Co. : Catalogue 39 : Cleveland Twist Drill Co. : Free Download, Borrow, and Streaming : Internet Archive

248 p., illus., 18.5 cm, trade catalog

archive.org

 

[MushCreek]

We used to make split collars like that to mount drills, etc. in holders for turret lathes and screw machines. A couple of those drills are flat bottomed, so probably from something like that.

 

[tarbellb]

Along the lines I was thinking too, thanks

What about the bits with a handheld knob??

 

[MushCreek]

Probably for deburring production parts.