SupraSupras key lock boxes are perfect for people wanting to keep a key secure outside. The Stor-A-Key lock boxes mount to any flat surface with four screws that are only visible when the safe is open. Access the key with a numerical code. The KeySafe is a portable option for temporary key storage. Perfect for houses for sale and apartments for rent. Allow multiple people access to an area with one key. Simply place the metal shackle around something sturdy while the box is open. Once closed, the key is securely stored.