Upgraded Robust Security Design: WINONLY door reinforcement lock is constructed from premium quality aluminum alloy and can withstand up to 800 lbs of force, making it 12-16 times stronger than a regular deadbolt against being kicked in. You may need 3 packs heavy-duty reinforcement door locks for your bedroom, front and back doors to prevent unauthorized entry, guard your home safe and protect your privacy.,Super Easy to Install and Unlock in One Second: WINONLY ez door lock includes detailed instructions and 8 strengthen scews, you can easily install the security door lock on the door frame within 5 minutes using a power screwdriver and drill. Metal reinforcement door lock upgraded groove design allows for swift locking and unlocking without requiring any tools, ensuring ease of operation, even in emergency.,Child proof & Tamper-Resistant: WINONLY child safety locks for doors features a spring-loaded mechanism that can be installed out of children's reach, prevent toddlers from opening the door to strangers or going out without permission. Moreover, the door safety locks from inside tamper-resistant features offer additional security against lock picking and bumping. Absolutely a must have door security devices in home security! Especiallly jam door lock for women who live alone and new parents.,For Most Doors Opening Inward:WINONLY door lock is suitable for most doors opening inward, this lock adds a robust layer of protection to your home, apartment, bedroom, front and back doors, as well as patio and courtyard doors. Please note: top door lock is not suitable for french double doors, garage doors, doors with gaps less than 0.07", outward opening doors, or doors with misaligned frames. It's an ideal gift choice for landlords, tenants, ladies, the elderly, pet owners, and new parents.,Reliable After-sale Service: Secure home by WINONLY, home security door lock defend your home safe, not only prevent break in but also easy open in emergency. WINONLY swing door latch lock provide a 5 years after-sale service, ensuring that you can purchase and use our front door child safety lock with confidence. Whether you encounter any issues during installation or use, our professional french door lock stopper customer service team is always ready to assist.