Durable and safe: The door bar limiter is made of premium zinc alloy, which is not easily broken and the structure is not deformed. Reliable protection: the safety chain of the door can provide reliable protection for users. Not only can forced entry be prevented, but it also helps you identify the caller before fully opening the door, which can provide additional security for the children's door. Easy to Install: This door guard safety limiter is easy to install, and the screws are included, you can fix the bolt tightly so it won't fall off easily. Superb Craftsmanship: This lock Heavy duty security door chain has a smooth surface which is comfortable to touch and does not hurt your hand during use, and it is not easy to rust. It will always look new and never fade Wide application: door lock bolt for door chain security is suitable for bedroom door lock, window guard , chain lock for front door, patio door security lock, hotel door lock, storage rooms etc. to protect against forced entry and intruders