Double-cylinder locks have a cylinder with a key on both sides. It is possible to find knobs that lock on both sides for both right and left handed doors. It is important to note that you should not install the door knob upside down. If you are installing a knob on a left-handed door, be sure to use the right type of knob.
A double-cylinder lock has keyed entry locks on both sides. That means that someone inside a house with a double-key lock stares at a lock in the place where a person with a single-key lock would see a knob. You'll need a key to close and open the door from the inside and outside. Double-cylinder locks have a key on both sides; they work with a key both from the outside and inside of the door.
This means that the owner of a home or business would need to use a key to engage or retract the lock bolt, even from the inside. This also applies to anyone considering the safety implications of having door handles with a key on both sides. If, for example, you need a door that closes on both sides for safety reasons, it would be best to get a lock with a key on both sides. Door knobs with a key on both sides are not always legal for home use and can therefore only be found in the commercial section of the home improvement store of your choice.
On the other hand, if you want to increase the level of privacy, such as in a bathroom, having a turnkey lock could be a good solution, since it is simple and safe. Privacy knobs are not only safer in case of emergency, but they are also more practical than door handles with a key on both sides. The privacy knobs also have locks on each side, but they can only be accessed with a key on one side. Among a variety of different lockable sliding door hardware, people even like to turn their thumbs more than regular keys.
It is vital to always have an additional key handy, in case occupants have to leave in case of emergency. Single-cylinder locks are locked and unlocked with a key on the outside of the door, but do not require a key to close or unlock on the inside side.
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