The actual hardware of the bolt should be made of hardened steel with a one-inch diameter. In most cases, you will use a digital code or a fingerprint to lock and/or unlock it. This type of deadbolt does not necessarily need a key to operate. While this type of deadbolt operates on the outside the same as any other, on the inside there is simply a thumb turn to lock and/or unlock it. As such, it’s not the most handy type of deadbolt to use. You will need a key to unlock a double-cylinder deadbolt from both the outside and the inside. It requires a key, but it can be opened from the inside of your home without a key. This is the most common type of deadbolt. Here’s a brief look at the different types of deadbolts you can buy. A home invader can easily break through a flimsy door. It doesn't matter how strong your lock is if your door frame isn't just as strong.
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