Safety Protection Design: Made of all-aluminum alloy, the sturdy door reinforcement lock can withstand 800 lbs of force, fixed with 4 screws. Equipped with four long and four short screws, a total of 8 screws. A must-have choice for providing extra door security to . Childproofing and Tamper-resistan:This door guardian has a spring-loaded design which can keep child safe. The child proof door locks can be installed higher on the door where your children can't reach! Plus, prevent child from opening the door to unknown people. Easy to Install: The safety door lock can be installed within 5 minutes with an electric drill and a screwdriver. The family quickly gained a sense of security. The allows you to quickly unlock it under any circumstances to avoid accidents. Unlock in One Second: Reach out and press the upper and lower grooves of the reinforced door lock and pull horizontally to the fully unlocked state to unlock. Unlocking and locking can be completed within a second with a little contact. The most convenient and fast door security device. Easy to Use: Place index finger on top of security door lock and thumb on bottom and slide lock away from the base plate along the the direction of the hinges then pull outward.This security door lock no tools required to open, just a little practice.Not only prevent breaking in but also easy to open in case of emergency., Weight: 0.75949249259 Pounds, Manufacturer: Quzenn