1. PRIVACY FUNCTION: The door lock can be secured from the inside by turning the knob and opened from the outside in emergencies without a key (using a coin or screwdriver). The interior handle provides privacy and is commonly used in areas such as guest rooms, bedrooms, bathrooms, interior doors, and other spaces where privacy is required. 2. EASY INSTALLATION: No professional door installer is needed—just a screwdriver to complete the installation quickly! 3. QUALITY MATERIAL: The sturdy door handle is made of aluminum alloy and brass components, making it rustresistant even in humidity. The thickened, robust design combined with quality materials ensures exceptional durability. 4. VERSION UPGRADE: The surface of our door handles is electroplated, offering better adhesion and a longer lifespan. The square door handles feature a minimalist line design and a matte black finish that complements most decor styles. They offer a smooth feel and enhance the beauty of your space.