Meet the RocLok: a realistic concrete rock with storage space for your keys. RocLok is extremely tough and capable of hiding several keys. It has a bullet-proof exterior and a 3 digit combination lock to keep your keys protected. The below video shows the RocLok in action:
The bad news is the manufacturer has decided to stop manufacturing the RocLok for the time being. The good news is you don’t need a rock to hide your keys with smart door locks with encryption hitting the market.