【MEASUREMENT OF TRACK DIMENSIONS】: Before ordering, please measure the dimensions of your window track to ensure compatibility with your window hardware. The track height must be greater than 0.48 inches, and the track width must be less than 0.61 inches. For a better shopping experience, please measure your window track first. | 【CHILD SAFETY WINDOW LOCKS】: Installing safety window locks effectively reduces the risk of children and pets falling out of windows. You can lock the windows after closing them, and when ventilation is needed, you can partially open and lock the windows. Window locks provide safety protection for your family. | 【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. . Our sliding window locks are made of aluminum alloy, which is sturdy, durable, non-deformable, and has a long service life. | 【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 3: 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. | 【THOUGHTFUL AFTER-SALES SERVICE】：After you receive the window lock, please feel free to contact us if you encounter any problems. We will reply to you within 24 hours and we will do our best to help you solve the problem.