🔓【Measure Your Window Track】The window lock is suitable for sliding windows, sliding doors and vertical windows. Before ordering the window lock, please measure the size of your window track, the width is less than 0.39 inches and the height is greater than 0.46 inches. The window lock is equipped with a vertical key and can be installed on the middle track of the window. 🔓【Double Lock Design and Protective Washer】The latest upgraded protective design in 2025, each window lock has two fixing holes, which greatly enhances the fixing force of the lock. You can tighten the lock clockwise with the included hex wrench to easily fix the window/door or vent. 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, and improves stability and safety. 🔓【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】8 security window locks, 8 mounting hex keys,8 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. 8 Sets Sliding Window Locks for Up and Down Windows,Easy to Install Vertical & Horizontal Window Security Locks,Adjustable Aluminum Window Stopper Lock(Silver)