Let’s dive into nine distinct characteristics I’ve observed among those who always make absolutely sure the door is locked.

Most consist of a metal piece, sometimes referred to as a claw, that fits over the bolt or latch on the existing door knob, and a lock that fits into the claw to prevent the door from opening.

Door Lock Ratings Protect your home and family with the best door lock or smart lock. Some door locks offer extra security with deadbolt and spring-bolt reinforcement technology.

It quickly upgrades almost any existing regular door to an access-controlled door — without any drilling. The new Knob Cylinder fits seamlessly and flexibly into a SMARTair® system, providing advanced ...

Depending on the door lock and style, you may have to remove the knobs to replace the lock. In some cases, there may be a set screw under the knob, and you can remove it with an Allen key.

Aperio® is a quick and simple way to bring any internal door into an access control system. The Aperio® cylinder is available for rubber and metal knobs, and for many door profiles: Euro, Scandinavian ...