I broke a drill bit, while holding it in my hand

SDE

Well-known Member
I found a rusty 1/2" bit on my floor. I was holding it in my hand, with the shank resting on my vise, and tapping it with a file, to knock the flakes of rust off the shank. It snapped in two at the middle of the drill, which was in the center of my hand. That part of the drill was not rusty. Why did it break?
Thank you
SDE
 

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