Keep Your Home SafeThe 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 InstallCome with strong screws. Simply mount the door lock on your door frame using a screwdriver or power tools. The installation takes less than 5mins. 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 & UnlockTo 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. ChildproofSecurity 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 DesignFeatures a spring-loaded, childproof and tamper-resistant design. High-quality aluminium material provides higher safety than traditional door locks to protects against unauthorized entry. Specifications Material: Aluminum Construction Finish Withstands up to 800 lbs of force Tamper resistant and child-safe design Use on primary entry doors to keep you and your family safe while inside Keep your home more secure while on vacation by installing these on secondary entrances such as back door or side doors Prevent lock bumping and lock picking (while in the locked position) Easy to install with screws (with 3 x 2.75inch and 4 x 0.75inch screws for one door lock) Easy to use: Pinch lock from top & bottom, pull towards door, pull lock holder towards you, move to full open position. Package 1 x Instruction 2 x Door Reinforcement Lock 14 x Screws