Product: 4-Pack Sliding Window Locks with Stop for Aluminum Alloy Door Frame - Security Lock Easy Installation: No extra tools required for installation. Each sliding window lock comes equipped with a hex key, allowing for quick and easy setup by simply holding the lock in place on the track with key control. Durable Material: Crafted from high-quality aluminum alloy with exquisite workmanship, these window locks are designed to be strong, solid, and sturdy. The inclusion of stainless steel screws ensures repeated use without degradation. Wide Usage: These versatile locks can be applied to most window types, providing a secure solution for various environments. They allow windows to be kept partially open for improved air circulation while preventing unauthorized opening, deterring burglars and thieves. Additionally, they help to protect from falling out of windows, ensuring family . Specifications: Size: 3 x 2.4 x 2.4 cm / 1.18 x 0.94 x 0.94 inch (L x W x H) Material: Aluminum alloy and stainless steel Quantity: 4 piecesPackage Includes: 4 x Sliding window locks with hex keys Brand: zhongchengdayeNote: Ensure that the window locks are compatible with your window type and size before purchasing. Follow the installation instructions for best results and security.