Simple yet effective. Dead Bolt Secure installs in a minute without removing your current lock. Simply loosen the 2 screws on the inside and slide Dead Bolt Secure behind the plate. That's it. Retighten the screws and you have installed a device gauranteed not to be picked or Bumped. Dead Bolt Secure easily flips over to prevent the deadbolt from turning. Simply flip back when exiting . Enjoy peace of mind.