Lucky Line Jumbo Magnetic Key Hider, Black, 1 Pack (91501) for Extra Large Keys and Transponders FITS EXTRA LARGE transponder and rubber-headed keys; dimensions are 2-3/16 inch (W) x 4-3/8 inch (L) x 7/8 inch (H); Inside depth is 3/4 inch TWO HEAVY DUTY magnets hold on to any steel surface; strong enough to be placed underneath a car and survive rough terrain DURABLE and rugged black plastic case with easy-slide lid keeps key secure and dry PERMANENT MOUNT OPTION with self-tapping screw for easy mounting, no drill required AVOID LOCKOUTS; Hide a key for emergencies or lockouts; safely hide a key for friends, family, neighbors, and children