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What kind of bits can a keyless chuck hold?

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Front view of a hexagonal and straight shank bits Providing it is the correct size, a keyless chuck with 3 jaws can accept bits with hexagonal or straight shanks.

What is the shank?

Three different screwdriver bits and bit holders with a circle around their shanks The shank is the part of a bit (such as a drill bit, screwdriver bit or bit holder) that is actually gripped by the chuck.

Screwdriver bits and bit holders usually have hexagonal shanks and drill bits usually have straight shanks.