“If you just have a dummy doorknob with no lock under it, like in the picture, what stops an intruder from just unscrewing/ pushing out the lower knob and using a hook to open the door from the backside?”
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If your doorknobs are installed correctly, the screws to remove the doorknob are on the inside and not accessible from the outside. That said, if it is possible to do this on a given door, then this lock does nothing to circumvent that. This would be a problem with any deadbolt that is not dual-cylinder.
Sorry, there was a problem. Please try again later.Even if you don't have a lock under the deadbolt the screws to remove the dummy lock should be on the inside. So there is nothing for the thief to unscrew. of course you could just take a hammer and punch out the doorknob even if there is a lock on it. Locks only stop casual thieves. if a professional wants in your house they are coming in. Of more concern is if you have windows or glass around the door then you can just break that reach in and unlock it.
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