Indestructible: The large key box with combination lock is made of high-quality zinc alloy and heavy-duty steel with excellent water resistance, corrosion resistance, and weather resistance. The outer shell of the key safe with combination lock is made of high-strength zinc alloy casting, which can effectively resist hammering, sawing, or prying. You can mount it in front of your house, garage door, warehouse, and office without having to carry a lot of keys. High security factor: The password of the key safe can be changed at will. It has 10,000 user-defined password combinations. You can set your own password and change it regularly to improve security. Installation is very simple. Take a photo or write down the password on paper after setting a new password. If you forget the password, you won't be able to use the key box again. Widely Used: The zinc alloy key box with combination lock is large enough (the internal size is approximately 3.94 x 3.15 x 1.38 inches) and can hold 8-12 keys, large car keys, and other small items. The product includes a combination lock, four heavy-duty screws, and four expansion nuts to ensure stable installation on any wall. It is ideal for sharing access rights with your roommates. Ideal for Sharing Keys: The external dimensions of the key safe are 11.0 x 8.5 x 4.0 cm / 4.33 x 3.35 x 1.57 inches. The key safe for outdoors is suitable for indoor and outdoor use. It is very suitable for daily needs such as cleaners, renovation workers, elderly people living alone, emergency medical care, family health visits, children's school, Airbnb and house rentals.