Measuring Window Tracks: Window locks are suitable for sliding windows, sliding doors and vertical windows. Before ordering a window lock, measure the window track dimensions, the height must be greater than 0.48 inches (1.22 cm) and the width must be less than 0.61 inches (1.55 cm). The window lock comes with a vertical key that can be applied to the middle track of the window Reduce Window Wear: Reasonable limitation of window opening and closing can avoid the wear and tear of window frames, hinges and other parts due to over-opening and closing of the window, prolonging the service life of the window and reducing the cost of repairing and replacing the window Safe and Reliable: It can effectively prevent children from accidentally climbing out of the window through the window due to curiosity or playing, reduce the risk of children falling from height, and provide additional safety protection for children in the family Premium Texture: Made of aluminium alloy, sturdy, ensure the limiter is not easy to be deformed or damaged in the process of using, effectively limiting the opening and closing of the window and guaranteeing the safety performance. There is a yellow plastic cover outside the key handle, which can be used for a long time Easy to Operate: Aluminium alloy window latch limiters are usually designed to be safe and easy to operate. It is easy to achieve the limitation of window opening and closing size. Users can quickly and accurately adjust the limiter to the right position according to the actual needs, to meet the ventilation, safety and other needs in different scenarios