Recessed strong Magnet Securely Attaches and Holds Case on any ferrous metal, steel or Iron surface, where only you can find it such as on your Door frame, behind rain Gutter, behind your car Bumper, inside Mailbox, behind Tonneau cover, Cubbyhole, even on your Refrigerator or other Metal object to keep an extra or hidden emergency spare key handy. Durable, Waterproof, Rust Free, Tough, Corrosion/Heat/Impact Weather-resistant Black ABS Plastic case construction, stays securely closed, Protects key safely, and will not rust or crack. Improved sliding cover design with built in stop to prevent cover from being dropped or misplaced. Easy to open, discreet design blends in with surrounding environments. Fits most larger Heavy duty & rubber headed home & auto keys, money, USB flash drive or small documents up to 3″ x 1-3/8″ x 1/4″.