1.DOUBLE PROTECTION - Door stoppers made of high-strength aluminum alloy. It firmly anchor your door to the floor, providing a strong support against door break-ins. When the deadbolt fails, the doorstop safety lock will still work to prevent intruders from entering your home. It is a powerful, effective, cheap and easy to use kit. 2.EASY TO INSTALL - You only need to prepare the drill bit and screwdriver, and the installation can be completed in a short time with instruction. Base plate height of 0.4" Requires at least a 0.5" clearance between bottom of door and the floor. 3.EASY TO USE - Simply slide the metal baffle into the base, and the simple operation creates an effective barrier. Buy you more time when there is an intruder. 4.USE IN MULTIPLE SCENARIOS - Security protection for blemished door, standard doors, french doors and barricade all your doors. As long as your floor can hold the base securely, it will work. 5.Make sure you check your door's clearance before buying，ensure the door can pass over completely,and Screw that came with it did not work in concrete,so you should pay attention to install if there is in concrete., Manufacturer: FLYINGAMZ