A mortise lock is one that requires a pocket to be cut into the door where the lock is to be fitted and is common in commercial construction.
Mortise locks are more durable due to the bigger bolts. The deadbolt is incorporated into the lock body, which makes it more secure, and it allows for the added benefit of releasing both the latch and the deadbolt when you turn the lever.
A mortise lock enables greater return spring, meaning the knob or handle returns easily to its original position. Due to the return spring, mortise locks are more durable than cylindrical locks.
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