[Quick Lock Mechanism] This innovative door security solution features a steel ball embedded in a movable handle, ensuring smooth operation. It serves as an enhanced alternative to traditional door chain locks. In emergencies, simply swing the bar to quickly secure the door. [Durable Construction] Crafted from robust zinc alloy, this door security device is designed for longevity, resisting breakage and structural deformation. The polished brushed nickel surface offers excellent anti-rust properties, keeping it looking new without damage or discoloration over time. [Child Safety Feature] One of the key benefits of this door restrictor is its ability to protect children. By installing the door guard out of their reach, you can prevent little ones from opening the front door, thereby reducing the risk of unwanted entry by strangers. [Versatile Application] This door lock can be positioned to open between 30-50mm, allowing you to securely see outside. It provides an opportunity to identify visitors without fully opening the door. You can also slightly open the door while securely locking it with the security bar, facilitating ventilation while maintaining safety. [Multi-Purpose Use] This front door lock enhances security against forced entry and is suitable for a variety of applications. Use it as a bedroom door lock, window guard, front door chain lock, or security lock for patio doors. It’s also ideal for securing hotel doors, storage rooms, verandas, and French doors, making it a versatile choice for enhancing safety in multiple settings.