Bits and Pieces - Weather Resistant Hide-A-Key Stone Safe Gadget - Fake Rock for Spare Key Hider or Other Small Objects Locked out of the house again? Just reach down and pick up a rock that you've strategically placed. You take out your key and let yourself in, problem solved! Our stone safe is a realistic looking rock that contains a secret compartment for hiding a key or another small object. Blends right in and can save you time and frustration. Weather resistant rock measures 4" x 3".