A bump-proof lock is a lock that cannot be opened by bumping it with specialized tools. Bump-proof locks are locked without the use of keyholes, which means that traditional lock-picking attempts will not work. Lock picking techniques involve inserting various instruments into the keyhole to manipulate parts of the bolt or latch mechanism attached directly to or inside the hole to open the door. Bump-proof locks combat this attack vector by moving all locking mechanisms below grade (often protected by two hefty deadbolts) and into one of these cylinders – each cylinder only receives power if both bolts are secure before entering their recesses for opening.