[Upgrade Safety Design]: The 3-inch metal structure security door lock is equipped with 4 screws, capable of withstanding a force of 800 lbs, making it 12 times stronger than a standard latch to help prevent forced entry. Each lock comes with 8 screws in total, including 4 long and 4 short screws, allowing installation flexibility based on your door setup. This reinforced lock enhances home security and provides added protection for your family. Suitable for residential use and ideal for improving door safety. [Easy to Install]: Use a power screwdriver and drill to install the security door lock on the door frame. Complete the installation in under 5 minutes to enhance your home’s safety. Designed to fit most inward-swinging doors. Includes an installation manual for guidance. May require a 1/8 in. drill bit and chisel if the door fits tightly against the jamb. [Easy to Use]: Place your index finger on the top and thumb on the bottom of the lock. Slide the lock along the hinge side and pull outward to disengage. No tools required for operation—simple and quick to use after minimal practice. Provides security against unauthorized entry while allowing fast release during emergencies. [Home and Child Safety]: This door lock adds an extra layer of security when protecting children or securing entry points. Features a spring-loaded design that helps prevent children from opening the door. Offers added peace of mind for families, seniors, and individuals seeking improved home safety. [High-Quality Security]: Designed for residential security, this door lock helps deter break-ins while remaining easy to operate in emergencies. 1) Tamper-resistant and child-safe design helps prevent unauthorized access. 2) Quick installation using hardened screws. 3) Cannot be opened from the outside. 4) Requires a drill, 1/8 in. drill bit, and screwdriver. 5) Chisel may be needed for tight door-to-jamb clearance (mortised installation). 6) Up to 12 times stronger than a standard latch. 7) Compatible with inward-swinging doors. Color: Silver Material: Metal Package Contents: 2 x Door Locks Note: Light reflection and display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.