This Masterlock 4-Digit Key Storage Unit is the ideal way to share access among several people without compromising security. Inside, there is space for up to 5 house or car keys. They are securely contained behind a 4-digit combination lock, so you can limit access to as few or as many people as you like. The stoarge unit is designed to be wall-mounted, and is constructed from sturdy zinc for protection from weather. A small shutter door protects the combination dials from dirt and grime.