Drill bit shank

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The shank is the part of a drill bit grasped by the chuck of a drill. The cutting edges of the drill bit are at one end, and the shank is at the other. Different styles of shank/chuck combination deliver different performance, such as allowing higher torque or greater centering accuracy.
Brace shank
Brace drill bit shank
Brace drill bit shank

This shank was common before 1850, and is still produced in 2005. At first, the tapered shank was just rammed into a square hole in the end of the drill. Over time, various chuck designs have been invented, and modern chucks can grasp and drive this shank effectively.

* Easy to make in a smithy
* Very wide tolerances allowable
* Moderate torque transmission but without the slippage common to round shanks
* Hard to grasp with any precision without the proper chuck