Helps keep the door in a slightly open position. You can easily and quickly install on different types of doors. We specially thickened each component of this security door lock, the chain can withstand huge impact and pressure. Anti-theft steel chain can enhance security and provide reliable protection against intrusion, spring buttons to enhance protection. Helps identify a caller before the door is fully unlocked. Color: Green Bronze Easy to install; suitable for wooden doors. Suitable for opening and closing interior doors, sturdy and durable, and can be widely used for the security and burglary of homes, hotels, apartments and yard doors. Material: stainless steel Applications: door lock, window lock, home door anti-theft lock, hotel room security lock Features: thick chain, thick base, more durable. Package Include: 1 x Set of Lock Chain Notes: 1. Due to the differences between different monitors, the picture may not reflect the actual color of the item. 2. Compare the detailed size with your height, please allow slight difference due to manual measurement.