Drills come in many different sizes and configurations. Despite these variances, cordless portable, corded and even big drill presses use a chuck to hold a drill bit needed for the boring operation. Some of these chucks are keyless, and some use a chuck key, but they all do the same job. Changing the bit on any drill is pretty much the same, and all it takes is a few simple steps.
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Locate the chuck key for your drill. Be sure that you have the correct key, otherwise damage may occur to the teeth on the chuck.
Insert the small nub at the end of the chuck key into the hole on the side of the drill chuck. The teeth should line up prior to insertion.
Rotate the chuck key counterclockwise, or to the left, to loosen the chuck. The chuck may be a little stiff but try not to apply too much force, as this could strip the teeth on the key or the chuck.
Remove the bit from the chuck by pulling it straight up and out once the jaws are loose enough. Tilting the bit to either side when removing it could break the bit on smaller diameter bits.