Don`t get locked out! The Magnetic Key Hider is perfect for cars or hiding spare keys. Magnetic Key Hider is made of rugged black plastic and holds X-Large, large and rubber headed keys. Two heavy-duty magnets keep hider inplace on metal surface where you want to hide a key for emergencies. Easy slide lid on rugged plastic box keeps keys secure and dry. Won`t rust closed. Self-Tapping screw included for permanent surface mount. 4-3/8 x 2-3/16 x 7/8 .