1. KEEP YOUR HOME SAFE – Designed to withstand 800 lbs. of force, this U 10827 satin nickel finish door reinforcement lock helps to prevent doors from being kicked in, increasing your home security and keeping you and your family ! 2. EASY INSTALLATION – The included 3 inch hardened screws make installation a breeze – extra security and peace of mind can be achieved in just minutes. Watch the video on this page for installation tips and operating instructions. 3. ADDITIONAL HOME SECURITY – Use this high security door reinforcement lock for additional home security on any swing-in door of any thickness. It helps to ensure any door cannot be opened from the outside. 4. CHILD-SAFE AND TAMPER-RESISTANT – The spring-loaded design can be installed at a higher level, to ensure it is child-. Plus, while locked, this tamper-resistant door latch protects against the door being kicked in, lock picking and bumping. 5. PRE-DRILLING – The included 3 inch security screws require holes to be pre-drilled with 1/8 inch drill bit. Do not use a drill driver with max torque setting to install the 3 inch screws as you can strip or break the heads. Some doors may require mortising. Additional mortising may be required to fit your door. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.