???Measure Your Window Track?Window locks are suitable for sliding windows, sliding doors and vertical windows. Before ordering window locks, please measure your window track size, the width is less than 0.39 inches and the length is greater than 0.31 inches. The window locks come with a vertical key and can be applied to the middle track of the window. ???Double Lock Design and Protective Washer?2024 latest upgraded protective design, each window lock has two fixing holes, which greatly enhances the holding power of the lock. You can tighten the lock clockwise with the included hex wrench to easily fix the window/door or allow ventilation. At the same time, in order to prevent your window track from being scratched, each of our window locks is equipped with a protective washer, which also enhances the friction between the window lock and the window track, improving stability and security. ???Two Keys for Easy Installation?Our window lock offer two mounting options for different widths of window track.Each set of window locks comes with a hex wrench and a vertical wrench. Choosing the one that best suits your needs to prevent scratching or protect your window track and improve the stability of your installation. Both methods are easy to install.No additional installation tools or drilling required,3-step quick installation.step1,place the lock to a suitable position.Step2,Insert gasket protect window track from scratches.Step3,tighten the screws,done!you can easily fix the window lock at any part with the vertical key or hex keys,easy to reuse and re-install. ???VERSATILE USABILITY?This upgraded window double lock is made of solid and reliable aluminum alloy with exquisite workmanship, is more secure, and can serve you for a long time using.Our sliding window security locks are widely used in a variety of situations, including homes, apartments, hotels, offices and more. The window lock can freely control the sliding window to partially open or completely close, preventing children or pets from accidents, preventing burglars and thieves from trespassing, the security window locks can provide you with more safety protection. ???What's You Get?4 security window locks, 4 mounting hex keys,4 protective gaskets, 1 vertical key for mounting to center track.Great thanks for choosing us and we care about the customer's purchase satisfaction.If you have any questions while using,just feel free to contact us,we will reply to you within 24 hours and surely offer you a satisfied solution.