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What the heck are these ?

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Sudsy:
Various sizes
Like hand drills with post guides
Maybe for flattening the bottom of a countersink hole ??

Bill Houghton:
They're counterbores - think "countersink," but with flat bottoms to the hole.  I've never seen a hand-powered one, though; must be intended for pretty soft wood or other soft material.

Or they're something else entirely...

Yadda:
Maybe a specialty security driver set?

Sudsy:

--- Quote from: Bill Houghton on May 02, 2024, 12:10:47 PM ---must be intended for pretty soft wood or other soft material.

--- End quote ---

You can see where they've been hardened at the tips. I doubt you'd do that for soft woods

Bill Houghton:
Looking at them again, I'm mystified.  The counterbore part doesn't look sharp at all - either they're worn down, or I'm misinterpreting what they're for.

And the pilot (center part that sticks out), which does, indeed, look either hardened or "burned," doesn't drill a hole; it goes into an existing hole.

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