External dimensions (H x W x D): 12.4 * 8.3 * 4.15 cm; Internal dimensions (H x W x D): 9.2 * 7.5 * 2.6 cm. The U-shaped hook measures 5.2 cm in height and 4.1 cm in width. The key box comes with a large internal space that can hold up to 5 keys or 3 large keys. You can also store cards, readers, etc. Your key safe has a weather-resistant sliding shutter cover and a waterproof rubber sleeve to protect the combination dials from dust, rain, snow, and ice. Confidently place keys in our 4-digit combination lock box. Resettable 4-digit combination for keyless convenience and you can set and reset your personalized password, allowing 10,000 personalized combination code options. Secure and share spare keys to your loved ones and family when you are at work or vocation. After resetting the password, it is better to take a photo to record otherwise no method to open it if you miss the password. Easy installation (mounting kit included). Metal construction for durability. It can be mounted on