PRACTICAL SET: You will receive 4 10 mm sliding window locks, including 2 black and 2 silver products, 2 hex keys, and 1 heart key, allowing you to easily adjust the window opening width, keep the window half-open or closed, and thus improve security and ventilation. This provides a complete solution for multiple windows in your home or office. FREE CONTROL OVER WINDOW WIDTH: With our set, you can freely control the window width, providing more security for ventilation or locking sliding windows and doors, and preventing children from opening the windows and climbing out. Thanks to their adjustability, these locks can be adapted to different window and sliding door sizes, easily changing the slot spacing, and using them conveniently. They are suitable for most sliding windows. UNIQUE HEXAGONAL LOCK CYLINDER DESIGN: Our sliding window lock features a hexagonal and heart-shaped lock cylinder design with a reinforced locking system that makes it difficult to unlock. Our sliding window lock offers strong protection to ensure your children's safety and prevent accidents with sliding doors and windows. In addition, our sliding door lock requires no drilling and is very easy to install. You just need to determine the installation position, fix it, place the lock on the window frame, adjust the gap as needed, and then turn the key. TWO TYPES OF KEYS: Our sliding window lock includes a hexagonal key and a heart-shaped key. You can choose the right key according to the gap height, and you no longer have to worry about not being able to use the product due to the gap height. The heart-shaped key is easy to install even in tight spaces and solves the problem of jamming. It can be used for ventilation and confinement, meeting your security needs with its versatility. ROBUST MATERIAL: This sliding door lock is made of reinforced stainless steel, has a brushed surface, is resistant to aging, sturdy and durable, not easily deformed, rust-proof, and of high quality. The sliding window lock is equipped with a non-slip washer, which protects the window from scratches and wear, improves the grip of the lock, increases security, and is reusable. WIDE APPLICATIONS: This sliding window lock is suitable for most types of windows and sliding doors, windows, and patio doors. The simple and elegant style suits most homes, hotels, apartments, schools, and offices. It's an easy-to-install solution that increases home security, creates a safe environment for children, and its simple and elegant style fits most homes.