Keep your home - 800 lbs. Designed to withstand the force, this U 10827 satin nickel coating door reinforcement lock increases the of your home and keeps you and your family ! - Together with 3 -inch hardened screws facilitate installation - extra and peace of mind can be achieved in just a few minutes. Watch the video on this page for installation tips and instructions for use. Additional home - Use this high -security door reinforcement lock for additional home at any thickness of any thickness. Helps to ensure that any door cannot be opened from the outside. Child and tamper -resistant - spring design can be installed at a higher level to ensure child . In addition, when it is locked, this tamper -resistant door latch provides protection against kicking, unlocking and multiplying the door. Pre -Drilling - Included 3 -inch screws must be opened in advance with a 1/8 -inch drill tip. Do not use a drill drive with a maximum torque setting to install 3 -inch screws, because you can strip or break your heads. Some doors may need to open a notch. It may be necessary to open additional notches to fit your door. Note - You may want to buy MP108278 high security finger with designed to facilitate this lock.