Product overview A heavy duty door chain and hasp that adds an extra layer of protection to interior and entry doors. Designed to prevent unwanted entry while allowing controlled opening for identification, ventilation, and privacy. Key benefits Increased security and privacy: Provides a simple mechanical barrier that prevents the door from being fully opened by visitors you do not admit. Controlled access: Allows the door to be opened a few inches for observation or airflow while keeping the door secured. Easy internal operation: Can be opened from the inside, with or without a key, for convenient and fast release. Durable construction: Die cast components combined with steel chain and fittings deliver reliable strength for everyday use. Includes chain support: Builtin chain support keeps the chain aligned and makes operation smoother. Features and specifications Function: Surfacemounted chain and hasp for partial door opening and secure latching. Materials: Die cast housing with steel chain and fittings for improved durability and wear resistance. Compatibility: Suitable for most residential interior and entry doors, including wood and metal doors. Works with left or righthand door orientations. Performance: Heavy duty design intended for frequent use to enhance door security without limiting ventilation or visitor screening. Practical uses Apartment or house entry: Allow tenants or homeowners to check visitors through a partial opening before admitting them. Shortterm rentals and guest rooms: Provide an additional security option for guests who want privacy and the ability to open the door slightly for deliveries or communication. Bedrooms and nurseries: Maintain the ability to monitor or ventilate a room while keeping the door secured. Installation and notes Surfacemount design fits most standard doors. Install with common household tools and appropriate screws or fasteners for the door and frame material. For performance, mount on a solid door frame and follow included installation instructions or consult a qualified installer if needed.