? ?Keep Your Home Safe?The 3" door lock is designed to withstand maximum 800lbs of force for Inward Swinging Door. It helps prevent doors from being kicked in. Increasing your home security and keeping your family safe. ? ?Easy to Install?Come with strong screws. Simply mount the door lock on your door frame using a screwdriver or power tools. The installation takes less than 5mins. It may be necessary to trim down a portion of the door frame if it is too thick ( 0.2'' (5mm) higher than the door ), as the excess thickness can hinder the installation process. Please check the image to see if our product is suitable for your door. All long and short screws included in the package are now suitable for the locking holes on the mounting plate per many customers' requirements. ? ?Easy to Lock Unlock?To unlock, pinch the door lock on the top and the bottom. Then slide the lock sideways along the door to the direction of the hinges until it can be pulled outward. ? ?Childproof?Security Door Lock adds extra security for children, prevent from opening door to strangers. Please install higher than the doorknob where your children can not reach. ? ?Great Design?Features a spring-loaded, childproof and tamper-resistant design. High-quality aluminium material provides higher safety than traditional door locks to protects against unauthorized entry.