Suitable for single-hung windows, double-hung windows, sliding windows, wooden windows, aluminum alloy windows, PVC windows and other window structures. The lock body size is 60x53x25mm, and the installation hole position is precise, adapting to most American window structures without the need for additional hole modifications. This model is specially designed for left-hand opening windows, and the direction of the lock tongue is fixed to ensure that it fits single-hung or double-hung windows that open to the left. The appearance of the classic American crescent lock has smooth lines and precise lock tongue structure, taking into account both decorative beauty and practical safety. Comes with 1 flat base + 4 mounting screws, ready to use right out of the box, easy and convenient installation, saving time and cost., Manufacturer: YINETTECH