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Two doorknobs that can be locked from both the inside and the outside.- One type locks from the inside by turning or depressing a small button, while a key must unlock the outside knob.
- Some models must be locked with a key on both the inside and outside.
- In other models, only the inside knob can lock or unlock both sides of the set.
- A medium security entrance-door lock.
- A quality feature on entry locksets is a deadlatch.
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