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No extra holes as long as the deadbolt holes are already there. Very easy to install and program. It only took me about 1/2 hour.
Sorry, there was a problem. Please try again later.No, if you already have an existing deadbolt (being single cylinder or double cylinder) it will fit right in place. No extra drilling needed. If you don't have a existing deadbolt then yes. You would to treat it as a deadbolt installation.
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