Safety lock:This sliding window lock can freely control the width of the window, prevent children from going out of the window, and ensure the safety of the family to some extent. Size: Single lock: 3 x 2.4 x 2.4cm / 1.18 x 0.94 x 0.94 inch. Suitable for rails with a height of more than 12mm and a thickness of less than 16mm (Note: if the window rail is located in the center of the window, this product cannot be used). Sturdy Material: Made of durable aluminum alloy with a yellow plastic cover on the outside of the wrench handle to prevent scratches or damage to the window, and can be used for a long time. Easy Installation: It can be installed without punching and is not easy to rust. Wide Application: The window lock is suitable for horizontal sliding windows, vertical sliding windows and sliding doors, such as patio doors , sliding glass doors, sliding windows, etc. Not suitable for plastic window frames.