This door lock is for kids safety,compared with the traditional door guardian, which the edge will hurt customer’s hand sometimes. And this new one is upgraded with plastic pad to avoid this from happening. The door lock prevent unwanted exits from your home and resist forced entry attempts. Doubles as a security device and a childproofing lock, providing peace of mind for you and your family. It works with inward swinging doors only. The child proof door lock resists forced entry and effectively secures, reinforces, and childproofs exterior doors. The locking mechanism slides out and rotates out of the way, and easily snaps back into place to block the door. It come with 4pcs strong screw. Simply mount the door lock latch on your door frame using screwdriver or power tools. The installation takes less than 5mins. For security, please install higher than the doorknob where your children can not reach, like top of door.