Have something small — cash, microfilm, an SD card loaded with private videos — that you want kept safe and out-of-sight?

Hide it in plain view with this Spy Bolt. Based on Cold War-era Soviet KGB hollow bolts, this handy gadget features a secret storage compartment that’s nearly half an inch in diameter and almost three inches long, offering plenty of room for covert communications.

And should the bolt find its way outside, either by accident or necessity, an O-ring seal around the top will keep the contents safe.