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Visited my Mom this past weekend to help go through my late father's tools.

Spent half a day sorting through machine tools for her.? Got some a few nice things for myself to round out my boxes, plus loads of inch-sized taps, dies, etc.

Anyhow, I've been going through the small bits and adding them to my existing stock.? Came across a few things and I either don't know what they are, or I'm not sure what their purpose is (ruler is for scale).? Any advice appreciated.

Have a couple of reamers with dedicated handles.? Were reamers commonly used by hand?? Doesn't seem a very accurate way to use them.



These reamers and counterbore or deburring tools have a square tapered shank.? What sort of tool would these go in?? Reminds me of something that would go in an auger.? Doesn't appear the shank is standardized.


Have a fair amount of gently tapered reamers with square shanks.? Just like the standard reamers I'm familiar with, but with a taper.? Most are so slightly tapered it's difficult to see without paying attention.

I'm familiar with more steeply tapered holes like for ball joints, but these are generally less than 1/2" and more often closer to 1/4" with a gentle taper that doesn't seem like it would be useful for something like a friction fit.? Is this maybe to make things like locating dowels easier to assemble?? If not, what's the common use (besides the obvious of making gently tapered holes)?