Drill bit shank
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The shank is the end of a drill bit grasped by the chuck of a drill. The cutting edges of the drill bit contact the workpiece, and are connected via the shaft with the shank, which fits into the chuck
Brace drill bit shank
Straight drill bit shank
Hex drill bit shank
SDS-plus drill bit shanks
Collet
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A collet is a segmented sleeve, band or collar. One of the two radial surfaces of a collet is usually tapered and the other is cylindrical. The term collet commonly refers to a type of chuck that uses
Drill bit shank
…chuck. Bits of diameter too small to grip firmly can have straight shanks of larger diameter than the drill, which can be held firmly in a standard size collet or chuck. Large drill bits can have straight shanks narrower than the drill diameter so that they can be fitted in chucks not able to chuck the full…
Several machine collets (top and centre) and a dismantled pin chuck (below).
ER Collet
R8 Collets
From left to right 5C, 2J and 3J collets. All 1" workholding size.