Double Lock Design: Sliding window locks use double screws to mount the sliding window/door rails, prevent slipping and provide more . Fully windows/doors or to provide ventilation with hexagonal switches (including), no extra tool is required. It comes with rubber cushioning to prevent scratches or damage in the window and increase window . How to use compatibility: Window locks are suitable for sliding windows, sliding doors and vertical doors. The locks are 2.4 -inch long, and with rubber cushioning, 0.4 inches width or rails with a width of 0.67 inch without rubber cushioning. Please measure your rail to ensure that you are sitting properly. : Window lock is made of aluminum alloy, durable and robust. The anti -rust coating makes it a good match for white sliding windows, sliding doors and vertical doors. In addition, other window locks are not fixed and not to comply with the middle rail, such as deficiencies, so you can ly buy. Convenient Status: Sliding window locks, sliding patio doors, sliding glass doors and so on. perfect for. Don't hesitate to open a few centimeters of windows for both fresh air and peace of mind, because they don't open enough for someone to enter your home without breaking the window and warning your dogs. Put a window lock in your child's room so that your child starts to walk from the window. Package Information: 4 -Sliding window lock package with rubber cushioning and switches; Applying multiple window locks can increase the of sliding door/window.