Door Reinforcement Lock – Add Extra Aluminum Construction High Security to your Home and Prevent Unauthorized Entry – 3 In. Stop <p>EASY INSTALLATION &ndash; The included 3 inch hardened screws make installation a breeze &ndash; extra security and peace of mind can be achieved in just minutes. Watch the video on this page for installation tips and operating instructions.<br />ADDITIONAL HOME SECURITY &ndash; 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.<br />CHILD-SAFE AND TAMPER-RESISTANT &ndash; The spring-loaded design can be installed at a higher level, to ensure it is child-safe. Plus, while locked, this tamper-resistant door latch protects against the door being kicked in, lock picking and bumping.<br />PRE-DRILLING &ndash; 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.</p>