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Pliers have sharp jaws and limited torque (mostly because they depend on the user's strength to hold their jaw clearance), and due to their design, do not have parallel jaws. Their non-parallel jaws, and these other factors, combine to exert uneven pressure, causing damage and rounding to nuts and bolts. After a few attempts with pliers, the fasteners may be too damaged to remove at all, and may need to be drilled out with a screw extractor or some other last-resort implement.

It is always preferable to use a wrench specifically designed and manufactured for the nuts or bolts needing removal.

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15y ago

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