This KeySafe has been designed following extensive consultation with users. It is made of heavy gauge stainless steel and a thick zinc-alloy shell. The 4096 possible combination codes offer a greater level of security and access is restricted to designated agents. A clutch mechanism prevents the handle from being forced open. If the C500 is locked and the handle is turned with force, the handle slips and turns easily without opening. Just turn the handle back to the closed position until it clicks to re-latch the handle.