Are you the type to always forget your house key? There are lots of places people hide house keys ranging from the fake rock to fake dog droppings. The problems with rock and droppings is they can be picked up and carried away during spring cleaning. Which is why this hollow sprinkler head might be a safer bet. Drop the key in to the hollow sprinkler and plant it out in your backyard. Next time you are locked out just go start searching for the hollow sprinkler that contains your key.