I’m sure you’ve seen those fake rock hide-a-key which let you stash a spare key under a fake rock. They’re extremely common and any burglar can easily find which rock is the fake one in your garden with little effort. The RocLok takes the fake rock and gives you an added level of security with a 3 digit combination lock underneath. You set the combination (mine’s 123, btw) to whatever you want and get additional peace of mind. RocLok is made of a realistic looking cement based product that gives it the look, feel, and weight (4-12lbs) of a real rock. Available in a number of different rock styles to match your landscaping. The key-hiding chamber is 3″ by 2″ to let you hide multiple keys.