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What is the definition of a Master Pin?

A unique key that can open multiple locks

A tumbler that creates additional shear lines

The definition of a Master Pin is accurately described as a tumbler that creates additional shear lines. In lockpicking and locksmithing, a master pin is a crucial component of a pin-tumbler lock mechanism. Master pins allow a single lock to be opened by more than one key through the creation of additional shear lines in the lock cylinder.

When both a regular key and a master key are inserted into the same lock cylinder, the master pins enable the lock to accommodate multiple keys that operate it. This design is fundamental in creating a master key system, where a master key can override several different locks, offering convenience and security, particularly in commercial or institutional setups.

In contrast, the other definitions do not accurately capture the nature of a master pin within the context of locksmithing, which is why they are not appropriate answers.

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A pin specifically for master keys

A type of key system used in automotive locks

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