In every cozy home and peaceful workspace, Windows are the gateway to the outside world, and window locks are the loyal guardians of safety and peace of mind. [HYIEOU] Window locks are specially designed for horizontal sliding Windows and vertical Windows to provide additional protection, with excellent quality and innovative design, for you to interpret the perfect combination of safety and convenience. ?CHILDPROOF WINDOW LOCK?: Adding a second level of security to prevent children and pets from falling accidents, plus it protects your family from intruders! Sliding door locks allow you to securely lock sliding doors and windows in place, whether fully closed or open for ventilation, window locks provide security for your home. ?MEASURE YOUR WINDOW RAILS?: Before ordering your window locks, please measure the dimensions of your window rails. The height must be greater than 0.48 inches (13 mm) and the width must be less than 0.61 inches (21 mm), ideal for installing a vertical window air conditioner or window sash. ?MULTI-FUNCTIONAL AVAILABILITY?: Sliding window security window locks are suitable for vertical and horizontal windows and can be used in homes, bedrooms, apartments, offices, etc. . ?QUALITY MATERIAL?: Our sliding window locks are made of aluminum to ensure superior strength and durability. It provides lasting security for your windows and doors as it is durable and stands the test of time. ?EASY INSTALLATION??3 steps quick installation, no additional installation tools or drilling required. Step 1, Place the lock in position to control window opening. Step 2, Insert the plastic washer to prevent the window track from being scratched. Step 5: Tighten the screws. Finish! The window lock can be installed on the side track and center track of sliding windows, the complimentary vertical heart key can be used freely according to different tracks.