This 3" Stop metal construction home security door lock with 4 screws designed to withstand 800Ibs of force, 12 times stronger than a normal deadbolt to against being kicked in. We equipped each door lock latch with 8 screws, including 4 long and 4 short, which you can choose according to your needs. Safety door lock guard your home safe. This reinforcement lock is a good choice for home security. And the perfect gift for your families. Home security door lock defend your home safe, not only prevent break-in but also easily opens when meeting urgently.