I Scored A Set Of Over-under Reamers For $40

[cazclocker]

At my local independent (not a chain) tool store, they had a set of what was labeled "over-under". I opened the wood lid and there was a tray of reamers! Basically it has a range of sizes from 3/16" to 1/2", by 1/16" increments. But instead of spot-on sizes, it had +.001" and -.001" of the sizes. For example, there was no .250" reamer, but there was a .249" and a .251". They were in kind of skungey shape, but seemed OK and they cleaned up nicely. I couldn't say no at $40!!
My question is, what are they good for? I could see using the "over" reamer to make a nice slip-fit or something, but what would the "under" ones be used for?
Thank you,
...Doug in Arizona

 

[JimDawson]

The under ones are great for tight dowel pin holes, or anything else that needs a press fit.

 

[cazclocker]

Ahh...yes, that makes sense. Thanks Jim!

 

[brino]

Hey Doug,

That sounds like a really good score! Congrats.

....and by the way, I somehow find your avatar super creepy!

I still have to find one for myself.......hhhmmmmmm......

-brino