This object is used in a geocache to provide a lock to a door which can be unlocked using magnets placed on the magnetsign on top of the lock.Designed with TinkerCad to be printed with a 3d printer. To complete this thing, you need: Construction: How it works: When one hold another magnet on the magnet sign, it will attract the bolt with the magnet arround is and thus lifting it which unlocks the door.