Double Cylinder Deadbolt Locks
The double keyed cylinder deadbolt lock is also a lockset that can be installed inside of the home. The difference between single-cylinder and double-cylinder deadbolt lock is that there is no twist or thumb turn inside the door, and there is a key cylinder on both sides of the door. Whether you are inside or outside the door, you always need a key to open the door.
The obvious disadvantage of double-sided key deadbolt is that if the door is locked, a key is always needed to open the door. In the event of a fire or other emergency, it will take more time to find and use the necessary keys, which may cause serious problems.
So if double cylinder deadbolt locks are used in a residential environment, it is strongly recommended to leave the key inside of the room to ensure safe exit in an emergency.
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