[Upgrade safety design]: The 3inch metal structure safety door lock is equipped with 4 screws, which can withstand the force of 800Ibs and is 12 stronger than the latch to prevent being kicked in. We have 8 screws for each latch, including 4 long screws and 4 short screws, which you can according to your needs. The safety door lock protects your safety. This kind of reinforced lock is a good choice for safety. It is also a perfect gift for your . [Easy to install]: Use an electric screwdriver and drill to install the safety door lock on the door frame. Complete the DIY door lock reinforcement installation in less than 5 minutes, and you will gain the safety of your . Easy to match any door swings inward. The safety door lock serves as a to your . high safety door locks are equipped with an installation manual. [Easy to use]: Place your finger on the top of the door lock safety device and your thumb on the bottom. the door lock from the base plate along the hinge direction, and then pull it outward. You 't need tools to open it, just a little practice. This door can prevent intrusion, it is easy to open in case of emergency. You will be more confident your door can withstand any form of forced entry. [ safety and child protection]: Child protection door locks additional safety measures for your children when you are on business trips. The door reinforcement lock adopts a spring design to prevent children from opening the door to strangers. When you are not at home, this door lock can protection for your children, and can also make the elderly or women feel at home. [High service]: Safe home, safety door lock protects your safety, not only to prevent intrusion, also easy to open in emergency meetings 1) Tamper resistant and child-safe design prevents children from wandering off unattended. 2) Install in just minutes using hardened screws. 3) Cannot be opened from the outside. 4) Requires Drill, 1/8 in. drill bit and screwdriver. 5) Chisel may be required if door fits tightly against the jamb (mortised installation). 6) 12x stronger than a common deadbolt. 7) Works on inward swinging doors. color:Silver Material:Metal Package Contents: 2 x door lock Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.