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Depending on the specific make and model of your drill and chuck, it may be possible to grip either or both with a regular open end wrench.

Some spindles have a hexagon-shaped portion, some have flats machined on two sides. Some chucks also have two flats or a hex shape machined either at the front or back end.

Depending on which portions you can fit a wrench to, you'll be using the Twin Wrench, Single Wrench or No Wrench Method.

Use the Twin Wrench Method whenever possible as this is more civilized and allows you to apply more controlled force.