Single Cylinder vs. a Double Cylinder
Single cylinder deadbolt locks use a key to lock and unlock from the outside and a knob, to lock and unlock on the inside. The obvious advantage is that you don’t have to hunt for the key to open the door from the inside.
The disadvantage is that if your door has glass panels, a burglar could break the glass, and unlock your door. The mail slot could be another problem, some burglars have been known to insert a device, through the mail slot and use it to open the door.
Double cylinder deadbolts need to be locked and unlocked with the key both from the outside and the inside. This means that even if they break through a glass panel the intruder is unable to get in without the key.
A key will need to be kept near the door, in case of emergency, particularly fire. Because a double cylinder deadbolt makes it difficult to exit your property in an emergency there are some local building codes that do not allow their use.
It may be possible for a burglar to use a saw blade between the door and the frame and saw his way through the deadbolt. To make that job more difficult high security deadbolt locks are available with internal anti-saw pins. The pins spin around with every stroke of the blade thus making the bolt very difficult to hack through.
Keep in mind though, a deadbolt door lock provides a high degree of security. But even the best locks fitted to a poor quality door will be a waste. Also, a good door and lock would be wasted if the frame of the door is weak.
Use high quality screws of at least 3” to secure the strike plate and strike box into the frame.
Electronic deadbolts are available that are operated by a keypad, a remote and even fingerprint recognition technology. It is the deadbolt itself, and not the method of operation, that makes a deadbolt lock such a good deterrent against break ins.
Rely on a quality Dallas Locksmith like Complete Security Service to give you the best deterrent to break ins and theft.
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