What You Will Receive: You will receive a reinforcement safety latch and 4 strong screws. Our latch inside stopper is made of aluminum alloy, which is safer than traditional door locks and can withstand up to 600 pounds of force, which is 10 times stronger than ordinary door bolts. This home security door lock is a good choice for home security. Excellent Quality: Our reinforcement safety latch uses a spraying process, which is anti-corrosion, anti-rust, anti-scratch and wear-resistant; the anti-collision and silent strips on the chain locks for inside door use imported soft glue to prevent damage to the door caused by impact. Easy to Install: The top door latch lock flip door guardian is easy to install. Just use a screwdriver or power tool to install the door lock latch on the door frame. When installing, you need to pay attention to the door and the door frame on the same plane, and the door gap cannot be less than 3mm. Easy to Use: The security door latch is simple to use. Pinch the top and bottom of the door lock, slide the lock away from the bottom plate along the hinge direction of the door, and then pull it outward. This high security door lock prevents break-ins, but it is easy to open in an emergency. Best Gift: The security door locks from inside is not only for you, but also the best gift for ladies, friends, elderly, pet owners, new parents, who can benefit from some extra safety equipment. The ultra-sturdy extra door lock from inside can only be used on inner opening doors, often used with inner opening doors, basement doors and garage doors, etc.