Because of their low strength and hardness, soft jaws conform to small irregularities on work pieces

Because of
their low strength and hardness, soft jaws conform to small irregularities on
work pieces and therefore result in better clamping. Chucks can be power or
manually actuated with a chuck wrench. Because they take longer to operate,
manually actuated chucks generally are used only for tool room and limited
production runs.

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