A Multi-Purpose Home Security Door Lock. Perfect for added security against: Intruders, Childproofing of door for children safety, Adds safety for loved ones with Alzheimer’s This security lock performs well on all in-swing Main entry doors, Garage entry doors, and even increased privacy on Interior Door, This Metal Safety Lock Locks from Inside, the 3″ lock surface area withstand 800 lbs. of Impact for Inward Swing Doors, Great for preventing unauthorized entry.