Prevent lock bumping, Prevent lock picking and prevent key bumping. Fit most standard single cylinder Deadbolt Locks. Install in less than three minutes with a Phillip head screwdriver, no drilling. Added extra security to your home, apartment, dome room... Work on In-Swinging door and Out-Swinging door. Provides added security and protection, feel safer when home alone Making Ladies and the Elderly Feel Safer when they are at home alone Safe to Operate in an Emergency Prevent Lock Bumping and Lock Picking with the Dead Bolt Secure. Prevent robbers from breaking in by ensuring the knob on a Deadbolt can't be turned from the outside regardless of Bump Keys, Lock Picking Tools or even a stolen working key. Install easily without having remove your current lock. Simply loosen the screws the hold your deadbolt plate in place, slide the Dead Bolt Secure behind the plate, retighten the screws and you are done. Flip the Dead Bolt Secure over the latch and you instantly have a lock that can’t be picked or bumped. Is an easy addition security to your home, apartment, dome room or workplace. Made of solid steel for long life and security Fit most standard single cylinder Deadbolt Locks, see images