A bolt engaged by turning a knob or key, rather than by spring action.
- When you turn the key from the outside, it releases both the knob and the deadbolt.
- Therefore, my front and rear doors are both equipped with double cylinder deadbolts, locks that require a key on the inside.
- Slowly, I reached out to shut off the ringer on the phone, then went to the door and made sure that all the deadbolts and double locks were securely in place.
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