GUARD YOUR HOUSE - Made of high-quality aluminum material, the window restrictor with keys is oxidation and corrosion resistant, helping to prevent damage or wear and tear. It can withstand greater pressure and helps ensure home security. CARE FOR YOUR FAMILY - The limited opening feature helps prevent children from falling through the window gap. After installing the cable locks, you can maintain proper ventilation while enhancing child safety. The safety lock can be unlocked to allow window access in emergencies. SIMPLE AND EASY TO INSTALL - Comes with fixing screws and key. These window safety restrictors are surface-mounted for easy installation, suitable for most users. WIDE APPLICATION - Ideal for use on UPVC, timber, and composite doors and windows. Suitable for homes, residential buildings, hospitals, schools, universities, and offices, helping provide a safer environment.