Yale's second great invention came around 1863, which he coined the name "Yale’s Magic Infallible Safe/Door Lock". This lock has many of the scintillating qualities of the Yale Bank Lock, and is designed for fire-proof safes and cash doors, among other items. It does not utilize springs, and is powder, damp, fire, and thief proof. The lock is not, however, a permutation lock, but each lock is unique and two different locks can never be opened with the same key. In addition, the key must be withdrawn from the lock before the bolt can be unlocked, preventing the liability of carelessly leaving the key in the keyhole.