【Reliable Material & Weatherproof】This wall mounted key lock box is made of zinc alloy and heavy duty steel, which is waterproof and rustproof, provides extra resistance to cutting and sawing, and it is environmentally friendly paint. 【4-Digit Password & High Security】With 4 dials, provides up to 10,000 combination possibilities, you can set any password you like without being cracked. 【Easy Installation & Wide Application】Comes with 4 screws and 4 expansion plugs, it is easy to install and can be mounted on any solid surface. It is suitable for both indoor and outdoor use.