1、Fits All Kinds of Sliding Doors Window: To make sure the window lock will fit your window perfectly, you can measure the sliding door/window track before ordering, the height must be greater than 0.39in and the width must be less than 0.39in. Our window locks are suitable for sliding patio doors, sliding window, sliding glass doors, vertical doors, retractable screen doors window, etc. 2、Quick and Easy Installation Saves Time and Effort: no additional installation tools or drilling required, a quick three step installation is required. Just place the lock in the right place and tighten the screws. 3、Adjustable Screw Lock: You can secure your windows in place so they won't be pulled or opened, and you can install multiple locks on various windows or doors at the same time for added security. 4、High Durability and Stability: This upgraded window double lock is made of sturdy and reliable aluminum alloy with excellent craftsmanship, rust and aging resistant, and more secure for your long term use. 5、Double Hole Design: This sliding window lock has two fixing holes, which greatly enhances the fixing force and security of the lock.