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The flats of a hex shank can either be machined on a round shank, as in the photograph, or can be the natural flats of hex bar stock. A hex shank can be grasped by a 3-jaw drill chuck, or can be held in a custom chuck specifically for hex shanks. 1/4 inch hex shanks are common for machine screwdriver bits, and have spread from that application to be used for drill bits that are compatible with screwdriver machinery.
* Zero manufacturing if the drill bit is made from hex bar stock
* Can be held in a drill chuck
* Can be held in a screwdriver bit chuck
* High torque transmission
* moderately accurate centring
* Cannot be held in a collet
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